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A037129
(nextprime(3^n)-nextprime(2^n))/2.
0
0, 1, 3, 9, 33, 107, 333, 1036, 3153, 9583, 29010, 87557, 263679, 793061, 2383280, 7158069, 21490605, 64504548, 193579176, 580868607, 1742867913, 5229128045, 15688432647, 47067395121, 141206379612, 423627527495, 1270899359726, 3812731633623, 11438262009764
OFFSET
0,3
FORMULA
a(n) = A037128(n) / 2. - Sean A. Irvine, Dec 09 2020
MATHEMATICA
Table[(NextPrime[3^n]-NextPrime[2^n])/2, {n, 0, 30}] (* Harvey P. Dale, Jun 08 2014 *)
CROSSREFS
Sequence in context: A219557 A094538 A343735 * A148987 A176812 A192430
KEYWORD
nonn
AUTHOR
EXTENSIONS
More terms from Sean A. Irvine, Dec 09 2020
STATUS
approved