A240163 Numbers n such that (k!+n)/k is prime for some k.

1, 2, 3, 4, 6, 8, 9, 10, 12, 15, 16, 18, 20, 22, 24, 25, 27, 28, 30, 32, 33, 35, 36, 38, 40, 42, 44, 45, 46, 49, 51, 52, 56, 58, 60, 63, 65, 66, 68, 70, 72, 74, 78, 80, 81, 82, 84, 85, 87, 88, 91, 92, 95, 96, 100, 102, 104, 105, 106, 108, 112, 114, 115, 116, 117, 120, 121, 123, 124, 126

Offset

1,2

Comments

Complement of A245757.

Links

Jens Kruse Andersen, Table of n, a(n) for n = 1..1000

Prog

(PARI)
a(n)=for(k=1, n, s=(k!+n)/k; if(floor(s)==s, if(ispseudoprime(s), return(k))))
n=1; while(n<200, if(a(n), print1(n, ", ")); n++)

Crossrefs

Cf. A245757, A245756.

Sequence in context: A064150 A259227 A196149 * A331819 A269045 A067023

Adjacent sequences: A240160 A240161 A240162 * A240164 A240165 A240166

Keyword

nonn

Author

Derek Orr, Aug 01 2014

Extensions

Typo in PARI code fixed by Colin Barker, Aug 02 2014

Status

approved