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A089362 Numbers n such that n^2 - 5n + 5 is prime. 0

%I

%S 5,6,7,8,9,11,12,13,14,16,19,22,23,24,27,29,33,34,38,41,42,44,47,48,

%T 49,51,53,56,57,58,59,62,63,67,71,73,79,86,88,89,92,96,97,99,103,104,

%U 106,117,118,123,128,129,133,134,137,141,143

%N Numbers n such that n^2 - 5n + 5 is prime.

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

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

%F a(n) = A002328(n)+2.

%o (PARI) is(n)=isprime(n^2-5*n+5) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A002328.

%K easy,nonn

%O 1,1

%A _Giovanni Teofilatto_, Dec 27 2003

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Last modified February 26 02:19 EST 2020. Contains 332270 sequences. (Running on oeis4.)