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 A186892 #8 Apr 07 2015 12:07:27 %S A186892 1,25,55,65,77,91,95,115,121,125,133,143,145,161,169,175,185,203,205, %T A186892 209,215,235,245,247,253,265,289,295,299,301,305,319,323,329,335,343, %U A186892 361,377,391,395,407,415,425,427,445,451,469,473,475,485,493,505,515,517,529,533,539,545,551,559,575,581,583,623,625 %N A186892 Nonprime numbers n such that the Stern polynomial B(n,x) is irreducible. %C A186892 See A186891 for all numbers n such that the Stern polynomial B(n,x) is irreducible. %H A186892 Charles R Greathouse IV, <a href="/A186892/b186892.txt">Table of n, a(n) for n = 1..10000</a> %o A186892 (PARI) ps(n)=if(n<2,n,if(n%2,ps(n\2)+ps(n\2+1),'x*ps(n\2))) %o A186892 is(n)=!isprime(n) && polisirreducible(ps(n)) \\ _Charles R Greathouse IV_, Apr 07 2015 %K A186892 nonn %O A186892 1,2 %A A186892 _T. D. Noe_, Feb 28 2011