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A091567 Primes p such that p^2-p-1 is prime. 21
3, 5, 7, 11, 17, 29, 31, 47, 61, 67, 71, 97, 101, 127, 131, 139, 149, 181, 197, 241, 269, 307, 331, 359, 379, 397, 409, 419, 421, 449, 457, 479, 487, 491, 599, 607, 617, 619, 641, 647, 677, 709, 751, 787, 839, 857, 907, 947, 967, 977, 997, 1051, 1061, 1091 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988

Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

MATHEMATICA

Select[Prime[Range[250]], PrimeQ[ #^2-#-1]&] - Alexander Adamchuk, Jul 27 2006

PROG

(PARI) isA091567(n)=isprime(n) && isprime(n^2-n-1) - Michael B. Porter, May 12 2010

CROSSREFS

Cf. A053182 (p^2+p+1 prime), A053184 (p^2+p-1 prime), A065508 (p^2-p+1 prime).

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

Sequence in context: A109543 A229168 A248714 * A241896 A076186 A092564

Adjacent sequences:  A091564 A091565 A091566 * A091568 A091569 A091570

KEYWORD

nonn

AUTHOR

T. D. Noe, Jan 21 2004

STATUS

approved

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Last modified October 15 20:04 EDT 2019. Contains 328037 sequences. (Running on oeis4.)