1,2
2^4+2^1+1=19 prime so a(1)=1
2^6+2^2+1=67 prime so a(2)=2
2^8+2^3+1=263 prime so a(3)=3
Adjacent sequences: A105178 A105179 A105180 this_sequence A105182 A105183 A105184
Sequence in context: A086736 A017846 A129976 this_sequence A096120 A050030 A046889
more,nonn
Pierre CAMI (pierrecami(AT)tele2.fr), Apr 11 2005
More terms from Ryan Propper (rpropper(AT)cs.stanford.edu), Jan 31 2008
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