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 A251859 #13 Aug 19 2019 17:24:19 %S A251859 1,6,5,10,3,2,8,7,13,20,30,28,27,26,35,58,45,56,55,21,96,142,53,93, %T A251859 262,14,139,12,195,47,87,57,214,404,133,255,81,252,37,36,187,128,127, %U A251859 479,75,572,477,313,70,475,179,68,241,310,19,98,115,469,762,114,234,94,302,231,1238,229,298,376,50,161 %N A251859 First appearance of prime(n) in A157480. %C A251859 Apparently all primes eventually appear in A157480. Note that this sequence is one-to-one map while A157480 not. %F A251859 A157480(a(n)) = prime(n), or prime(a(n))+prime(n) is a square. %e A251859 a(3)=5 because A157480(5)=prime(3)=5 and prime(3)+prime(5)=5+11=16=4^2, %e A251859 a(4)=10 because A157480(10)=prime(4)=7 and prime(4)+prime(10)=7+29=36=6^2. %Y A251859 Cf. A157480. %K A251859 nonn %O A251859 1,2 %A A251859 _Zak Seidov_, Dec 10 2014