A102265 Smallest prime for which 2^n exactly divides the class number h(8p) and X^2 - 2pY^2 = -1 is solvable.

5, 41, 113, 3089, 12641, 50753, 675569, 1410977

Offset

1,1

Links

Table of n, a(n) for n=1..8.

H. Cohn and J. C. Lagarias, On the existence of fields governing the 2-invariants of the classgroup of Q(sqrt{dp}) as p varies, Math. Comp. 41 (1983), 711-730.

Crossrefs

Sequence in context: A139846 A201718 A142101 * A337393 A262340 A128347

Adjacent sequences: A102262 A102263 A102264 * A102266 A102267 A102268

Keyword

nonn,more

Author

N. J. A. Sloane, Feb 19 2005

Status

approved