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 A064256 #13 Oct 17 2019 05:59:05
%S A064256 3528,4620,8208,13668,21858,24978,26538,29268,30828,33870,34260,34728,
%T A064256 44088,51030,58128,58440,61560,72948,79578,80670,95568,107580,109608,
%U A064256 112338,118188,118890,124350,126690,142758,144708,148530,176220,191898,196578,198528,208590
%N A064256 Numbers m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,39.
%C A064256 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1).
%D A064256 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.
%H A064256 Amiram Eldar, <a href="/A064256/b064256.txt">Table of n, a(n) for n = 1..10000</a>
%t A064256 carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 39}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* _Amiram Eldar_, Oct 17 2019 *)
%Y A064256 Cf. A087788.
%K A064256 nonn
%O A064256 1,1
%A A064256 _N. J. A. Sloane_, Sep 23 2001
%E A064256 Offset corrected and more terms added by _Amiram Eldar_, Oct 17 2019