This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A231203 #16 Feb 16 2025 08:33:20 %S A231203 3200,6272,6400,9344,12416,12544,12800,15488,18560,18688,21632,24704, %T A231203 24832,25088,25600,27776,30848,30976,33920,36992,37120,37376,40064, %U A231203 43136,43264,46208,49280,49408,49664,50176,51200,52352,55424,55552,58496,61568,61696 %N A231203 Numbers of the form (24*x + 1)*2^(y+6) with positive integers x and y. %C A231203 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. %H A231203 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/FermatNumber.html">Fermat Number</a> %Y A231203 Cf. A000215. %K A231203 nonn %O A231203 1,1 %A A231203 _Arkadiusz Wesolowski_, Nov 05 2013