

A066081


a(n) = smallest m such that m+2^j and m2^j are prime for all 0 < j <= n.


4




OFFSET

1,1


COMMENTS

Is this sequence infinite?


LINKS



EXAMPLE

94, 92, 9+2, 9+4 are prime, but not 5+4 = 7+2, therefore a(2) = 9.


CROSSREFS



KEYWORD

hard,nonn


AUTHOR



EXTENSIONS

a(7) from Jim Fougeron (Feb 07) confirmed by Phil Carmody, who also found a(8) (Feb 14 2002).


STATUS

approved



