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 A254765 #11 Feb 14 2015 23:44:54 %S A254765 1,1,3,1,5,1,3,7,3,1,7,9,1,5,7,3,5,1,9,11,7,1,9,5,11,13,11,3,7,17,11, %T A254765 1,7,13,3,1,7,13,5,15,21,11,7,13,5,9,1,17,23,1 %N A254765 Fundamental positive solution y = y1(n) of the first class of the Pell equation x^2 - 2*y^2 = A007522(n), n >=1 (primes congruent to 7 mod 8). %C A254765 For the corresponding term x1(n) see A254764(n). %C A254765 See A254764 for comments and the Nagell reference. %C A254765 The least positive y solutions (that is the ones of the first class) for the primes +1 and -1 (mod 8) together (including also prime 2) are given in A002335. %F A254765 A254764(n)^2 - 2*a(n)^2 = A007522(n) gives the smallest positive (proper) solution of this (generalized) Pell equation. %e A254765 A254764(4)^2 - 2*a(4)^2 = 7^2 - 2*1^2 = 47 = A007522(4). %Y A254765 Cf. A007522, A254764, A254766, A254929, A254760, A254761, A254762, A254763, A002335. %K A254765 nonn,easy %O A254765 1,3 %A A254765 _Wolfdieter Lang_, Feb 12 2015