Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

1,1

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.

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

A173257 := proc(n)

A214028(A002144(n)) ;

end proc:

seq(A173257(n), n=1..50) ;

Sequence in context: A064540 A264826 A199712 * A103560 A198562 A244334

Adjacent sequences: A173254 A173255 A173256 * A173258 A173259 A173260

nonn,easy

R. J. Mathar, Jul 07 2012

approved