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A091176 Numbers n such that prime(n) is of the form 2*k^2 - 1. 6
4, 7, 11, 20, 25, 31, 46, 53, 68, 87, 106, 118, 152, 163, 190, 204, 247, 344, 377, 418, 436, 474, 492, 516, 558, 580, 647, 669, 713, 816, 894, 975, 1003, 1028, 1179, 1300, 1392, 1526, 1561, 1695, 1768, 1917, 1952, 2069, 2177, 2343, 2601, 2643, 2769, 2812 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
A066436 indexed by A000040.
LINKS
FORMULA
A000040(n) = A066436(n).
MATHEMATICA
Flatten[Position[Prime[Range[3000]], _?(IntegerQ[Surd[(#+1)/2, 2]]&)]] (* Harvey P. Dale, Jan 23 2013 *)
CROSSREFS
Sequence in context: A109328 A228079 A083839 * A002974 A130625 A104102
KEYWORD
nonn
AUTHOR
Ray Chandler, Dec 25 2003
STATUS
approved

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Last modified May 18 14:54 EDT 2024. Contains 372640 sequences. (Running on oeis4.)