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 A173257 #28 Jan 05 2025 19:51:39 %S A173257 3,7,8,5,19,10,27,31,36,44,48,51,55,28,17,75,79,87,91,96,9,23,116,40, %T A173257 64,15,139,140,49,78,159,28,175,22,187,39,199,200,102,211,216,224,114, %U A173257 231,255,65,271,279,71,16 %N A173257 Pell sequence entry points for primes == 1 (mod 4). %H A173257 R. J. Mathar, <a href="/A173257/b173257.txt">Table of n, a(n) for n = 1..1000</a> %H A173257 Neville Robbins, <a href="https://web.archive.org/web/2024*/https://www.fq.math.ca/22-4.html">On Pell numbers of the form p*X^2, where p is prime</a>, Fib Quart. 22 (4) (1984) 340, Table 2. %F A173257 a(n) = A214028(A002144(n)). %p A173257 A173257 := proc(n) %p A173257 A214028(A002144(n)) ; %p A173257 end proc: %p A173257 seq(A173257(n),n=1..50) ; %K A173257 nonn,easy %O A173257 1,1 %A A173257 _R. J. Mathar_, Jul 07 2012