1,1

Pell's equation X^2-AY^2=1 with A=a(n); X=50*a(n)-1 [A154358] or [A154359]; Y=250n-180 [A154360], or Y=250n-70 [A154361]

a(n)=25n^2-14n+2

For n=0, a(0)=2; n=3, a(3)=185

Cf. A154355, A154358, A154359, A154360, A154361

Sequence in context: A109112 A163190 A004027 this_sequence A161130 A007509 A077413

Adjacent sequences: A154354 A154355 A154356 this_sequence A154358 A154359 A154360

nonn

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 08 2009