A231203 Numbers of the form (24*x + 1)*2^(y+6) with positive integers x and y.

3200, 6272, 6400, 9344, 12416, 12544, 12800, 15488, 18560, 18688, 21632, 24704, 24832, 25088, 25600, 27776, 30848, 30976, 33920, 36992, 37120, 37376, 40064, 43136, 43264, 46208, 49280, 49408, 49664, 50176, 51200, 52352, 55424, 55552, 58496, 61568, 61696

Offset

1,1

Comments

Let F(m) = 2^(2^m) + 1 be a Fermat number. If F(m) = (a*2^n + 1)*(b*2^n + 1) for some n >= m + 2 and a and b are odd, then a + b is in the sequence.

Links

Table of n, a(n) for n=1..37.

Eric Weisstein's World of Mathematics, Fermat Number

Crossrefs

Cf. A000215.

Sequence in context: A269114 A035896 A224646 * A035777 A108001 A212074

Adjacent sequences: A231200 A231201 A231202 * A231204 A231205 A231206

Keyword

nonn

Author

Arkadiusz Wesolowski, Nov 05 2013

Status

approved