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 A245029 #19 Sep 08 2022 08:46:08 %S A245029 1,2,4,5,7,8,10,13,14,16,19,20,26,28,35,37,38,40,52,56,65,70,73,74,76, %T A245029 80,91,95,104,112,130,133,140,146,148,152,182,185,190,208,247,259,260, %U A245029 266,280,292,296,304,364,365,370,380,455,481,494,511,518,520 %N A245029 Divisors of 3^36 - 1. %C A245029 Also, divisors of 9^18-1. Number of divisors of k^18-1 for k = 2..20: 32 (2), 128 (3), 512 (4), 512 (5), 128 (6), 640 (7), 160 (8), 1280 (9), 640 (10), 1024 (11), 512 (12), 2048 (13), 1024 (14), 1536 (15), 8192 (16), 3840 (17), 512 (18), 5120 (19), 512 (20). %H A245029 Bruno Berselli, <a href="/A245029/b245029.txt">Table of n, a(n) for n = 1..1280</a> %H A245029 <a href="/index/Di#divisors">Index entries for sequences related to divisors of numbers</a> %e A245029 150094635296999120 = 2^4 * 5 * 7 * 13 * 19 * 37 * 73 * 757 * 530713. %t A245029 Divisors[3^36 - 1] %o A245029 (PARI) divisors(3^36-1) %o A245029 (Sage) divisors(3^36-1) %o A245029 (Magma) Divisors(3^36-1); %o A245029 (Maxima) divisors(3^36-1); %Y A245029 Cf. A018614: divisors of 3^6-1. %Y A245029 Cf. A113522: divisors of 10^18-1; A003543: divisors of 2^36-1. %K A245029 nonn,fini,full %O A245029 1,2 %A A245029 _Bruno Berselli_, Jul 10 2014