A105176 Numbers n such that (p(n)#)*(4*(p(n)#)+1)-1 is prime, where p(i)# = i-th primorial.

1, 2, 4, 6, 7, 17, 23, 34, 201, 706, 1413, 2265

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Crossrefs

Sequence in context: A272634 A084591 A088758 * A061937 A065804 A328768

Adjacent sequences: A105173 A105174 A105175 * A105177 A105178 A105179

Keyword

nonn

Author

Pierre CAMI, Apr 11 2005

Status

approved