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 A214790 #10 Nov 25 2014 14:04:39 %S A214790 10,11,19,31,79,131,179,239,251,379,419,431,439,479,499,571,599,631, %T A214790 659,719,751,839,971,1019,1091,1171,1259,1319,1559,1619,1759,1811, %U A214790 1831,1879,1931,1979 %N A214790 Numbers n such that A214789(n) = n-6. %C A214790 It is still a conjecture that 10 is the only nonprime in this sequence. This sequence is disjoint from A214791. %o A214790 (PARI) is(n)=my(k); while(((Mod([1, 1; 1, 0], n))^k++)[1, 2]!=-8, ); k==n-7 \\ _Charles R Greathouse IV_, Nov 25 2014 %Y A214790 Cf. A214789, A214791, A214792. %K A214790 nonn %O A214790 1,1 %A A214790 _Art DuPre_, Aug 03 2012