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 A054002 #17 Oct 27 2023 22:00:45 %S A054002 4,6,4,8,16,8,8,12,12,8,4,10,8,4,8,12,8,16,16,16,16,8,16,12,16,16,8,8, %T A054002 4,16,8,24,16,4,16,8,4,32,8,16,16,16,8,8,8,8,16,32,8,8,16,16,16,12,16, %U A054002 16,12,8,48,32,8,24,24,16,16,16,8,16,24,64,8,16,16,16,16,64,24,32,60 %N A054002 Number of divisors of n such that n and n-1 have the same sum of divisors. %H A054002 Amiram Eldar, <a href="/A054002/b054002.txt">Table of n, a(n) for n = 1..10135</a> (from the b-file at A002961) %F A054002 a(n) = tau(A002961(n) + 1). %o A054002 (Magma) [#Divisors(n):n in [2..3500000]| SumOfDivisors(n) eq SumOfDivisors(n-1)]; // _Marius A. Burtea_, Sep 07 2019 %Y A054002 Cf. A000005, A000203, A002961, A053249, A054003. %K A054002 nonn %O A054002 1,1 %A A054002 _Asher Auel_, Jan 12 2000 %E A054002 More terms from _Naohiro Nomoto_, Jun 23 2001