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 A110885 #9 Feb 13 2015 13:09:11 %S A110885 399,5719,20705,80189,120581,162687,482143,663679,1162349,7274249, %T A110885 8734109,9486399,10260809,10397407,14658349,14970499,25603599, %U A110885 29010079,32869759,49412285,77801359,90393029,95972799,99467679,105818129,110066669,125532329,126325399 %N A110885 Lucas-Carmichael numbers that are not congruent to 11 (mod 12). %C A110885 There are 9967 Lucas-Carmichael numbers less than 10^12, and all but 332 are congruent to 11 (mod 12). %H A110885 Robert G. Wilson v, <a href="/A110885/b110885.txt">Table of n, a(n) for n = 1..333</a> %e A110885 5719=7*19*43=7 mod 12. %p A110885 with(numtheory); LC:=[]: for z from 1 to 1 do for m from 1 to 2000000 do n:=2*m+1; if not(isprime(n)) and issqrfree(n) then PF:=factorset(n); lcb:=true; for x in PF do if (n+1) mod (x+1) > 0 then lcb:=false fi od; if lcb then LC:=[op(LC),n]; fi; fi; #not od; #m od; #z select(proc(z) not(z mod 12 = 11) end, LC); %Y A110885 Cf. A006972. %K A110885 nonn %O A110885 1,1 %A A110885 _Walter Kehowski_, Sep 19 2005 %E A110885 a(10) onward from _Robert G. Wilson v_, Feb 12 2015