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 A211873 #20 Mar 04 2024 01:14:37 %S A211873 0,2,8,14,22,24,28,42,52,58,62,64,72,84,92,94,98,114,122,134,142,148, %T A211873 168,178,188,202,212,218,244,248,262,274,282,302,304,308,314,318,324, %U A211873 328,338,342,352,358,364,372,374,392,394,398,402,408,414,434,442,448,478,484,492,498 %N A211873 Numbers b >= 0 such that 2 b^2 + 3 b + 5 is prime. %C A211873 An example of Sun's conjecture in A217788: For a(n)>5, also bases b such [2;3;5] seen as a number written in base b, is prime. %H A211873 Paolo P. Lava, <a href="/A211873/b211873.txt">Table of n, a(n) for n = 1..1000</a> %o A211873 (PARI) n=#v=[2,3,5];for(b=0,500,ispseudoprime(sum(k=1,n,b^(n-k)*v[k]))&print1(b",")) %o A211873 (Magma) [b: b in [0..500] | IsPrime(2*b^2+3*b+5)]; // _Bruno Berselli_, Apr 11 2013 %Y A211873 Cf. A224217. %K A211873 nonn %O A211873 1,2 %A A211873 _M. F. Hasler_, Mar 31 2013