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%I #26 May 26 2016 15:27:04
%S 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 64,15,139,140,49,78,159,28,175,22,187,39,199,200,102,211,216,224,114,
%U 231,255,65,271,279,71,16
%N Pell sequence entry points for primes == 1 (mod 4).
%H R. J. Mathar, <a href="/A173257/b173257.txt">Table of n, a(n) for n = 1..1000</a>
%H Neville Robbins, <a href="http://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 a(n) = A214028(A002144(n)).
%p A173257 := proc(n)
%p A214028(A002144(n)) ;
%p end proc:
%p seq(A173257(n),n=1..50) ;
%K nonn,easy
%O 1,1
%A _R. J. Mathar_, Jul 07 2012
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