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A079649 Numbers n such that n! + n^2 + n + 1 is prime. 1
0, 3, 5, 17, 24, 314 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

1!+1^2+1+1 = 1+1+1+1 = 4, which is not prime. 2!+2^2+2+1 = 2+4+2+1 = 8, which is not prime. 3!+3^2+3+1 = 6+9+3+1 = 19, which is prime, so a(1)=3.

MATHEMATICA

For[i = 1, i < 1000, If[PrimeQ[Factorial[i] + i^2 + i + 1] == True, Print[i]]; i++ ]

CROSSREFS

Sequence in context: A025106 A333199 A203193 * A255401 A263811 A323194

Adjacent sequences:  A079646 A079647 A079648 * A079650 A079651 A079652

KEYWORD

nonn

AUTHOR

Neil Fernandez, Jan 22 2003

STATUS

approved

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Last modified June 23 18:45 EDT 2021. Contains 345402 sequences. (Running on oeis4.)