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A102265 Smallest prime for which 2^n exactly divides the class number h(8p) and X^2 - 2pY^2 = -1 is solvable. 1
5, 41, 113, 3089, 12641, 50753, 675569, 1410977 (list; graph; refs; listen; history; text; internal format)
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 * A262340 A128347 A056905

Adjacent sequences:  A102262 A102263 A102264 * A102266 A102267 A102268

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, Feb 19 2005

STATUS

approved

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Last modified June 19 19:03 EDT 2019. Contains 324222 sequences. (Running on oeis4.)