

A175633


Numbers x such that x^2  28*y^2 = 1 for some integer y.


2



1, 127, 32257, 8193151, 2081028097, 528572943487, 134255446617601, 34100354867927167, 8661355881006882817, 2199950293420880308351, 558778713173022591438337, 141927593195654317345029247
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OFFSET

1,2


COMMENTS

This sequence gives the values of x in solutions of the Pell equation x^2  28*y^2 = 1; the corresponding y values are in A175672. [Edited by Jon E. Schoenfield, May 04 2014]


LINKS



FORMULA

a(n) = 254*a(n1)  a(n2) (with a(1)=1, a(2)=127).


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



