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 A064261 #10 Oct 17 2019 05:58:14
%S A064261 660,2718,12420,57990,82980,89448,127080,142368,174120,184998,202638,
%T A064261 216750,229980,233508,234978,280548,297600,329940,331998,341700,
%U A064261 384918,406380,412848,421080,433428,455478,503988,505458,533388,578370,608358,675978,768588,779760
%N A064261 Values of m such that N=(am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,49.
%C A064261 am+1, bm+1, cm+1 are primes and am | (N-1), bm | (N-1), cm |(N-1).
%D A064261 Harvey Dubner (harvey(AT)dubner.com), personal communication, Jun 27 2001.
%H A064261 Amiram Eldar, <a href="/A064261/b064261.txt">Table of n, a(n) for n = 1..10000</a>
%t A064261 carmQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Select[Range[10^5], AllTrue[(v = {1, 2, 49}*# + 1), PrimeQ] && carmQ[Times @@ v] &] (* _Amiram Eldar_, Oct 17 2019 *)
%Y A064261 Cf. A087788.
%K A064261 nonn
%O A064261 1,1
%A A064261 _N. J. A. Sloane_, Sep 23 2001
%E A064261 Offset corrected and more terms added by _Amiram Eldar_, Oct 17 2019