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A176683 Numbers k such that k^2 +-11 are primes. 5
90, 120, 210, 270, 300, 510, 690, 720, 780, 960, 1200, 2190, 4260, 4350, 4470, 4920, 4980, 5040, 5100, 5250, 5550, 5670, 5730, 5790, 6810, 8100, 8280, 8490, 8610, 9150, 9540, 9990, 10140, 10200, 10650, 11130, 11430, 12060, 12510, 12930, 13770, 13800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

EXAMPLE

90 is in the sequence, because 90^2 - 11 = 8089 and 90^2 + 11 = 8111 are primes.

MATHEMATICA

Select[Range[8! ], PrimeQ[ #^2-11]&&PrimeQ[ #^2+11]&]

CROSSREFS

Cf. A097698, A108701, A176681, A176682

Sequence in context: A039401 A044004 A078493 * A135197 A025371 A025362

Adjacent sequences:  A176680 A176681 A176682 * A176684 A176685 A176686

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Apr 23 2010

STATUS

approved

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Last modified October 27 20:18 EDT 2021. Contains 348290 sequences. (Running on oeis4.)