A124085 Least k such that k*p(n)!/p(n)# +1 is prime starting with n=3,(p(i)=i-th prime).

1, 3, 6, 2, 2, 9, 4, 2, 6, 22, 15, 3, 5, 19, 31, 31, 36, 2, 15, 26, 7, 3, 70, 22, 21, 52, 9, 96, 115, 49, 21, 8, 12, 110, 20, 5, 55, 55, 29, 34, 71, 194, 63, 94, 92, 105, 20, 5, 58, 4, 241, 34

Offset

3,2

Links

Table of n, a(n) for n=3..54.

Example

3*2*3*4*5*6*7/(2*3*5*7) +1 = 73 prime so k(4)=3 as p(4)=7

Crossrefs

Sequence in context: A133358 A058099 A292789 * A132120 A021280 A282728

Adjacent sequences: A124082 A124083 A124084 * A124086 A124087 A124088

Keyword

nonn

Author

Pierre CAMI, Nov 25 2006

Status

approved