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 A064257 #11 Oct 17 2019 05:58:44
%S A064257 306,7686,9900,24168,32778,68448,86160,107070,112236,148398,172998,
%T A064257 207930,217770,221706,231546,250488,277548,292800,303378,306576,
%U A064257 329208,354300,380130,398580,488616,490338,492798,501408,533388,559218,567828,605220,619980,640890
%N A064257 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,41.
%C A064257 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1).
%D A064257 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.
%H A064257 Amiram Eldar, <a href="/A064257/b064257.txt">Table of n, a(n) for n = 1..10000</a>
%t A064257 carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 41}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* _Amiram Eldar_, Oct 17 2019 *)
%Y A064257 Cf. A087788.
%K A064257 nonn
%O A064257 1,1
%A A064257 _N. J. A. Sloane_, Sep 23 2001
%E A064257 Offset corrected and more terms added by _Amiram Eldar_, Oct 17 2019