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 A191456 Primes p such that the polynomial x^2+x+p generates only primes for x=1..9. 12
 11, 17, 41, 844427, 51448361, 86966771, 122983031, 180078317, 960959381, 1278189947, 1761702947, 1829187287, 2426256797, 2911675511, 3013107257, 4778888351, 5221343711 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..2713 PROG (PARI) is(n)=for(x=0, 9, if(!isprime(x^2+x+n), return(0))); 1 \\ Charles R Greathouse IV, Sep 14 2015 CROSSREFS Generates primes for x=1..k: A001359 (1), A022004 (2), A172454 (3), A187057 (4), A187058 (5), A144051 (6), A187060 (7), A190800 (8), this sequence (9), A191457 (10), A191458 (11), A253592 (12), A253605 (13). Each is by definition a subsequence of preceding sequences. Subsequence such that x=10 gives a composite number: A211238. Cf. A160548, A164926. Sequence in context: A331940 A187060 A190800 * A146036 A248482 A267772 Adjacent sequences:  A191453 A191454 A191455 * A191457 A191458 A191459 KEYWORD nonn AUTHOR Zak Seidov, Jun 02 2011 STATUS approved

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Last modified January 25 06:44 EST 2022. Contains 350565 sequences. (Running on oeis4.)