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 A089373 Numbers k such that k^2 - 7*k + 7 is prime. 2
 0, 7, 10, 12, 15, 16, 22, 25, 27, 31, 36, 37, 40, 46, 51, 52, 55, 57, 60, 61, 67, 75, 85, 87, 90, 97, 102, 106, 111, 120, 136, 151, 156, 157, 162, 171, 172, 177, 180, 186, 192, 202, 205, 211, 220, 222, 225, 237, 240, 241, 250, 255, 261, 267, 271, 277, 282, 286, 291, 292 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 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 Vincenzo Librandi, Table of n, a(n) for n = 1..10000 MATHEMATICA Column[(0), Select[Range[6, 200], PrimeQ[ #^2-7#+7]&]] (* Vincenzo Librandi, Dec 12 2011 *) PROG (Magma) [0], [n: n in [6..300] | IsPrime(n^2 - 7*n + 7)]; // Vincenzo Librandi, Dec 12 2011 (PARI) is(n)=isprime(n^2-7*n+7) \\ Charles R Greathouse IV, May 22 2017 (GAP) Concatenation([0], Filtered([7..300], k->IsPrime(k^2-7*k+7))); # Muniru A Asiru, Nov 24 2018 CROSSREFS Cf. A089376 (primes of the form k^2 - 7*k + 7). Sequence in context: A128783 A024586 A050419 * A184114 A345478 A295797 Adjacent sequences: A089370 A089371 A089372 * A089374 A089375 A089376 KEYWORD easy,nonn AUTHOR Giovanni Teofilatto, Dec 27 2003 EXTENSIONS More terms from David Wasserman, Sep 15 2005 a(1)=0 inserted by Vincenzo Librandi, Dec 12 2011 STATUS approved

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Last modified June 12 14:48 EDT 2024. Contains 373331 sequences. (Running on oeis4.)