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 A186893 #10 Mar 21 2017 11:09:24 %S A186893 1,3,7,11,31,59,127,251,377,433,1019,1969,2047,3449,4091,8191,11327, %T A186893 15737,16379,32689,36737,64889,65531 %N A186893 Numbers n such that the Stern polynomial B(n,x) is irreducible and self-reciprocal. %C A186893 This appears to be numbers of the forms 4^k-5 for k>1, 2^p-1 for odd primes, and 377, 433, 1969, 3449, 11327,.... %F A186893 Intersection of A186890 and A186891. %Y A186893 Cf. A186890, A186891. %K A186893 nonn %O A186893 1,2 %A A186893 _T. D. Noe_, Feb 28 2011