Guest Posted October 23, 2008 Report Share Posted October 23, 2008 Here are two number sequences. A. 1, 1, 2, 3, 5, 10, 20, 39, 78, 155, 309, 617, 1234, 2467, 4933, 9865, 19729, 39457, 78914, 157827, 315653. B. 1, 2, 5, 13, 39, 116, 348, 1044, 3131, 9392, 28174, 84521, 253562. What are the sequences? What should the next numbers be? Peace, and good luck. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 23, 2008 Report Share Posted October 23, 2008 IS the first one followed by: 631305, 1262609, 2525217, 5050433, 10100865, 20201730? Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 25, 2008 Report Share Posted October 25, 2008 ooh close i'll give you a hint: it has nothing to do with multiplying by 2 (in A) or by 3 (in B), it just happens like that. Quote Link to comment Share on other sites More sharing options...
0 bonanova Posted October 26, 2008 Report Share Posted October 26, 2008 631306, 1262612, 2525223, 5050446, 10100891, 20201782,... The number of digits in the nth Fermat number. Quote Link to comment Share on other sites More sharing options...
0 Guest Posted October 26, 2008 Report Share Posted October 26, 2008 (edited) That wasn't what my answer is, but its right.. kinda, but now what is B? I'll give you another hint: the two sequences are very similar, and they were made in the same way, just with different numbers. Edited October 26, 2008 by andrwcpr Quote Link to comment Share on other sites More sharing options...
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Guest
Here are two number sequences.
A. 1, 1, 2, 3, 5, 10, 20, 39, 78, 155, 309, 617, 1234, 2467, 4933, 9865, 19729, 39457, 78914, 157827, 315653.
B. 1, 2, 5, 13, 39, 116, 348, 1044, 3131, 9392, 28174, 84521, 253562.
What are the sequences? What should the next numbers be?
Peace, and good luck.
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