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A102708
Composite numbers a(n) having a GCD with Pell_x(a(n))-1 equal to 1 (where Pell_x(n) is the x solution of the Pell-Fermat equation: x^2 - n y^2 = 1). There is no square in the sequence because the Pell-Fermat equation has no solution for them.
0
27, 51, 65, 85, 123, 125, 145, 171, 185, 187, 243, 265, 267, 291, 325, 339, 363, 365, 387, 411, 425, 445, 451, 459, 481, 485, 493, 531, 533, 565, 603, 627, 629, 685, 697, 699, 731, 771, 779, 785, 803, 843, 845, 865, 867, 901, 925, 949, 963, 965, 985, 1003
OFFSET
0,1
CROSSREFS
Sequence in context: A109067 A034595 A330279 * A154591 A217235 A265683
KEYWORD
nonn
AUTHOR
Thomas Baruchel, Feb 05 2005
STATUS
approved