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 A166101 #6 Jun 13 2021 08:28:43 %S A166101 1,13,37,121,181,337,433,793,937,1093,1261,1633,2521,3037,3313,3901, %T A166101 4213,4537,5221,7141,7561,8437,9841,10333,10837,11353,11881,14701, %U A166101 15301,17173,19153,19837,21961,22693,23437,25741,27337,28153,29821 %N A166101 Integers k such that A166100(k)/A005408(k) is not an integer. %H A166101 A. Karttunen, <a href="/A166101/b166101.txt">Table of n, a(n) for n = 1..92</a> %o A166101 (MIT Scheme with macro MATCHING-POS by AK:) %o A166101 (define A166101 (MATCHING-POS 1 0 (lambda (i) (not (integer? (/ (A166100 i) (A005408 i))))))) %Y A166101 A166102 gives the corresponding odd numbers. Cf. A166272. %K A166101 nonn %O A166101 1,2 %A A166101 _Antti Karttunen_, Oct 13 2009