A173257 Pell sequence entry points for primes == 1 (mod 4).

3, 7, 8, 5, 19, 10, 27, 31, 36, 44, 48, 51, 55, 28, 17, 75, 79, 87, 91, 96, 9, 23, 116, 40, 64, 15, 139, 140, 49, 78, 159, 28, 175, 22, 187, 39, 199, 200, 102, 211, 216, 224, 114, 231, 255, 65, 271, 279, 71, 16

Offset: 1

Author

R. J. Mathar, Jul 07 2012

Keywords

• nonn
• easy

Links

• R. J. Mathar, Table of n, a(n) for n = 1..1000
• Neville Robbins, On Pell numbers of the form p*X^2, where p is prime, Fib Quart. 22 (4) (1984) 340, Table 2.

Programs

Maple

A173257 := proc(n)
        A214028(A002144(n)) ;
end proc:
seq(A173257(n),n=1..50) ;

Formula

a(n) = A214028(A002144(n)).