A089362 - OEIS

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A089362

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

5, 6, 7, 8, 9, 11, 12, 13, 14, 16, 18, 19, 22, 23, 24, 27, 29, 31, 33, 34, 38, 41, 42, 44, 47, 48, 49, 51, 53, 56, 57, 58, 59, 62, 63, 67, 68, 69, 71, 73, 79, 86, 88, 89, 92, 96, 97, 99, 103, 104, 106, 117, 118, 123, 128, 129, 133, 134, 137, 141, 143, 144, 147, 148, 151, 152, 156, 157, 158, 161, 162, 163, 166, 167, 172

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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

Table of n, a(n) for n=1..75.

FORMULA

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

PROG

(PARI) is(n)=isprime(n^2-5*n+5) \\ Charles R Greathouse IV, Jun 13 2017