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 A065698 #13 Oct 17 2019 16:20:06 %S A065698 5580,19488,22050,86466,140268,173208,177966,227010,233598,265806, %T A065698 273126,355110,395736,402690,432336,476988,486138,550188,578370, %U A065698 588618,754416,788088,844086,1044288,1092600,1204596,1217406,1386498,1415778,1446888,1463358,1563276,1566936,1599876 %N A065698 Numbers m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,61. %H A065698 Amiram Eldar, <a href="/A065698/b065698.txt">Table of n, a(n) for n = 1..10000</a> %F A065698 am+1, bm+1, cm+1 are primes and am|(N-1), bm|(N-1), cm|(N-1). %t A065698 CarmichaelNbrQ[n_] := ! PrimeQ@n && Mod[n, CarmichaelLambda@ n] == 1; Select[ Range@ 1600000, PrimeQ[# +1] && PrimeQ[2# +1] && PrimeQ[61# +1] && CarmichaelNbrQ[(# +1) (2# +1) (61# +1)] &] (* _Robert G. Wilson v_, Jul 31 2017 *) %Y A065698 Cf. A064238-A064262, A065695-A065703, A087788. %K A065698 nonn %O A065698 1,1 %A A065698 Harvey Dubner (harvey(AT)dubner.com), Nov 14 2001 %E A065698 a(8) onward from _Robert G. Wilson v_, Jul 31 2017