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
Keywords
Links
- Jens Kruse Andersen, Table of n, a(n) for n = 1..1000
Programs
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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++)
Extensions
Typo in PARI code fixed by Colin Barker, Aug 02 2014
Comments