OFFSET
1,1
COMMENTS
Except for the first term, all terms are powers of 4.
FORMULA
a(n) = 2^A001223(n).
MATHEMATICA
Table[2^(Prime[k + 1] - Prime[k]), {k, 100}] (* T. D. Noe, Nov 14 2012 *)
2^(#[[2]]-#[[1]])&/@Partition[Prime[Range[70]], 2, 1] (* Harvey P. Dale, Nov 30 2017 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Giovanni Teofilatto, Oct 20 2012
STATUS
approved