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 A339550 #7 Dec 09 2020 01:14:55 %S A339550 1,9,85,697,1285,2605,4573,5845,6001,6241,6613,7141,7453,8005,10897, %T A339550 12453,13141,15445,19789,20345,21445,21913,22873,25957,36565,36601, %U A339550 39597,44761,46405,53677,56137,56593,61013,63445,70094,72913,76977,80913,82405,87085,87601 %N A339550 Numbers k such that A339549(k) = A339549(k+1). %C A339550 Analogous to A338452 as A339549 is analogous to A093653. %H A339550 Amiram Eldar, <a href="/A339550/b339550.txt">Table of n, a(n) for n = 1..10000</a> %e A339550 9 is a term since A339549(9) = A339549(10) = 4. %t A339550 f[n_] := Times @@ (DigitCount[#, 2, 1] & /@ Divisors[n]); Select[Range[10000], f[#] == f[# + 1] &] %Y A339550 Cf. A000120, A093653, A338452, A339549. %K A339550 nonn,base %O A339550 1,2 %A A339550 _Amiram Eldar_, Dec 08 2020