Guest Posted February 26, 2009 Report Share Posted February 26, 2009 These are harder the other ones on this sight. But with the proper insight, they can be done. 1. 0,1,5,11,27,42,78,106... 2. 2,2,4,10,14,24,42... 3. 3,4,6,8,12,14,18,20,24,30... 4. 0,1,4,13,23,48,69,118 5. 0,2,7,15,26,40,57,77 6. 1,1,3,4,6,9,10,16 7. 1,1,2,3,7,16 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 I doubt you will answer this for me but are these math riddles or more of like application sequences like 31,30,31,30=January, Feburary,March,April, etc. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 I doubt you will answer this for me but are these math riddles or more of like application sequences like 31,30,31,30=January, Feburary,March,April, etc. They're mathematical sequences like: 1,2,3,4,5,6,7,8,9 (0+1)(1+1)(2+1)... 1,4,9,16,25,36,49,64 (1^2)(2^2)... except they're not as easy Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 They're mathematical sequences like: 1,2,3,4,5,6,7,8,9 (0+1)(1+1)(2+1)... 1,4,9,16,25,36,49,64 (1^2)(2^2)... except they're not as easy Oh, ok. (I probably don't belong here then. I don't take algebra until next year>) Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 I sit here in the silence and wonder if there is anyone out there. Shall I go down into the midst of obscurity, or shall I choose the correct moment to post myself to the top of the forum? The real question is, Is their anyone around that likes math? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 i am bored of solving these kind of puzzles....need something new Quote Link to comment Share on other sites More sharing options...
0 bonanova Posted February 26, 2009 Report Share Posted February 26, 2009 These are harder the other ones on this sight. But with the proper insight, they can be done. 1. 0,1,5,11,27,42,78,106... 2. 2,2,4,10,14,24,42... 3. 3,4,6,8,12,14,18,20,24,30... 4. 0,1,4,13,23,48,69,118 5. 0,2,7,15,26,40,57,77 6. 1,1,3,4,6,9,10,16 7. 1,1,2,3,7,160,1,5,11,27,42,78,106, 170, 215, 315, 381 ...2,2,4,10,14,24,42...3,4,6,8,12,14,18,20,24,30, 32, 38, 42, 44, 48, 54, 60 ...0,1,4,13,23,48,69,1180,2,7,15,26,40,57,77, 100, 126, 155, 187, 222, 260, 301 ...1,1,3,4,6,9,10,16, 15, 25, 21, 36, 28, 49, 36, 64 ...1,1,2,3,7,16, 65, 321, 4546, 107587 ... Spoiler for what: for odd n add triangular number = n(n+1)/2; for even n add square = n2...primes + 1...number of cards in an n-tiered house of cards = n(3n+1)/2odd: triangular numbers; even: squaresa(n) = a(n-1) + a(n-2)2 = ? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 0,1,4,13,23,48,69,118,154,235,290,411 i had to try as you tried Sequence 0,1,4,13,23,48,69,118,154,235,290,411 Differences 1 3 9 10 25 21 49 36 81 55 121 odd numbers are square of 1 3 5 7 9 11 and even numbers 3*1 5*2 7*3 9*4 11*5 Quote Link to comment Share on other sites More sharing options...
0 bonanova Posted February 26, 2009 Report Share Posted February 26, 2009 0,1,4,13,23,48,69,118,154,235,290,411i had to try as you triedSequence 0,1,4,13,23,48,69,118,154,235,290,411 Differences 1 3 9 10 25 21 49 36 81 55 121 odd numbers are square of 1 3 5 7 9 11 and even numbers 3*1 5*2 7*3 9*4 11*5 Good one. Now what's #2?In 4, the even triangular numbers are used. In 1, the odd triangular numbers are used. Quote Link to comment Share on other sites More sharing options...
0 Pickett Posted February 26, 2009 Report Share Posted February 26, 2009 Yeah, I see numbers 1, 3, 4 (thanks to sachins), 5, 6, and 7...but yeah, 2 is eluding me right now...hmm... Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 26, 2009 Report Share Posted February 26, 2009 Yeah, I see numbers 1, 3, 4 (thanks to sachins), 5, 6, and 7...but yeah, 2 is eluding me right now...hmm... Yeah, I kind of realized it would be a hard one when I made it, but here's a small hint. Notice anything about the digits? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 66 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 (edited) 2,2,4,10,14,24,42,62,92,134 It might not be the answer yo are expecting but nevertheless it could be one of the answers Add 3 numbers 8,16,28,48,80,128,196,288 Diff of 1st 2 nos. 8,12,20,32,48,68,92 Diff of 1st 2 nos. 4,8,12,16,20,24 Edited February 27, 2009 by sachins19 Quote Link to comment Share on other sites More sharing options...
0 bonanova Posted February 27, 2009 Report Share Posted February 27, 2009 2,2,4,10,14,24,42,62,92,134It might not be the answer yo are expecting but nevertheless it could be one of the answersAdd 3 numbers 8,16,28,48,80,128,196,288 Diff of 1st 2 nos. 8,12,20,32,48,68,92 Diff of 1st 2 nos. 4,8,12,16,20,24 Wow. Clapping. I think he had something else in mind from his clue, but what you found is pretty solid. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 It might not be the answer yo are expecting but nevertheless it could be one of the answers Add 3 numbers 8,16,28,48,80,128,196,288 Diff of 1st 2 nos. 8,12,20,32,48,68,92 Diff of 1st 2 nos. 4,8,12,16,20,242,2,4,10,14,24,42,62,92,134 I congratulate you, it seems to be solved. But I couldn't get it, it's my fault of course. How did you add 3 numbers to 2,2,4,10... and get 8,16,28.... Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 How did you add 3 numbers to 2,2,4,10... and get 8,16,28.... Add 2, 2, 4 = 8 then 2, 4, 10 = 16 Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 I have an alternative and simpler solution for #2It's a kind of fiobonucci? series beginning with 2,2 and in base 6. 2+2=4 4+2=6=10(base 6) 4+10=14(base 6) 10+14=24(base 6) 14+24=42(base 6) then 24+42=110(base 6) 42+110=152(base 6) 110+152=302(base 6) Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 good one... Quote Link to comment Share on other sites More sharing options...
0 Guest Posted February 27, 2009 Report Share Posted February 27, 2009 I have an alternative and simpler solution for #2It's a kind of fiobonucci? series beginning with 2,2 and in base 6. 2+2=4 4+2=6=10(base 6) 4+10=14(base 6) 10+14=24(base 6) 14+24=42(base 6) then 24+42=110(base 6) 42+110=152(base 6) 110+152=302(base 6) Nobody got it (I mean the Person) Quote Link to comment Share on other sites More sharing options...
Question
Guest
These are harder the other ones on this sight.
But with the proper insight, they can be done.
1. 0,1,5,11,27,42,78,106...
2. 2,2,4,10,14,24,42...
3. 3,4,6,8,12,14,18,20,24,30...
4. 0,1,4,13,23,48,69,118
5. 0,2,7,15,26,40,57,77
6. 1,1,3,4,6,9,10,16
7. 1,1,2,3,7,16
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