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A105176
Numbers n such that (p(n)#)*(4*(p(n)#)+1)-1 is prime, where p(i)# = i-th primorial.
0
1, 2, 4, 6, 7, 17, 23, 34, 201, 706, 1413, 2265
OFFSET
1,2
CROSSREFS
Sequence in context: A272634 A084591 A088758 * A061937 A065804 A374123
KEYWORD
nonn
AUTHOR
Pierre CAMI, Apr 11 2005
STATUS
approved