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A119570 Primes p such that p^2 - p - 1 is not prime. 0
2, 13, 19, 23, 37, 41, 43, 53, 59, 73, 79, 83, 89, 103, 107, 109, 113, 137, 151, 157, 163, 167, 173, 179, 191, 193, 199, 211, 223, 227, 229, 233, 239, 251, 257, 263, 271, 277, 281, 283, 293, 311, 313, 317, 337, 347, 349, 353, 367, 373, 383, 389, 401, 431, 433 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..55.

MATHEMATICA

Select[Prime[Range[250]], Not[PrimeQ[ #^2-#-1]]&]

PROG

(MAGMA) [p: p in PrimesUpTo(700)| not IsPrime(p^2-p-1)] // Vincenzo Librandi, Jan 29 2011

CROSSREFS

Cf. A091567 (Primes p such that p^2-p-1 is prime),

A091568 (Primes of the form p^2-p-1, where p is prime).

Sequence in context: A020585 A038943 A019343 * A018485 A097234 A122139

Adjacent sequences:  A119567 A119568 A119569 * A119571 A119572 A119573

KEYWORD

nonn

AUTHOR

Alexander Adamchuk, Jul 27 2006

STATUS

approved

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Last modified July 6 08:22 EDT 2020. Contains 335476 sequences. (Running on oeis4.)