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A137459 Prime numbers n such that n^2 +- (n-1) are primes. 1
2, 3, 13, 163, 193, 349, 541, 769, 1093, 1231, 1423, 1549, 1621, 1693, 1801, 2011, 3049, 3511, 4003, 4111, 4159, 5839, 6091, 6421, 6703, 6883, 7573, 7753, 8929, 9043, 9601, 9769, 9781, 12781, 13633, 14821, 15091, 15439, 16141, 16759, 17863, 18493 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

2^2 +- 1 -> (3,4) Primes,

3^2 +- 2 -> (7,11) Primes,

13^2 +- 12 -> (157,181) Prime

MATHEMATICA

Select[Prime[Range[800]], PrimeQ[ #^2-(#-1)]&&PrimeQ[ #^2+(#-1)]&]

CROSSREFS

Sequence in context: A224792 A153888 A068083 * A267422 A072162 A113785

Adjacent sequences:  A137456 A137457 A137458 * A137460 A137461 A137462

KEYWORD

nonn,easy

AUTHOR

Vladimir Joseph Stephan Orlovsky, Apr 21 2008

EXTENSIONS

More terms from Stefan Steinerberger, Apr 26 2008

STATUS

approved

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Last modified November 21 16:04 EST 2019. Contains 329371 sequences. (Running on oeis4.)