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A090612 n-th prime is of the form 2*k^2+1. 4
2, 8, 21, 38, 153, 191, 232, 279, 327, 378, 493, 559, 1086, 1272, 1360, 1769, 1989, 2111, 2224, 2344, 2471, 3272, 3721, 3863, 4838, 5006, 5359, 6291, 6871, 7077, 7909, 8127, 9245, 9928, 10654, 10889, 12164, 12957, 13764, 14881, 16034, 16343, 16944 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

COMMENTS

A090698 indexed by A000040.

FORMULA

a(n)=k such that A000040(k)=A090698(n)=2*A089001(n)^2+1.

CROSSREFS

Cf. A089001, A089008, A090698.

Sequence in context: A001471 A162585 A000159 * A051744 A062443 A141582

Adjacent sequences:  A090609 A090610 A090611 * A090613 A090614 A090615

KEYWORD

nonn

AUTHOR

Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 21 2003

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Last modified February 17 23:05 EST 2012. Contains 206085 sequences.