A037129 (nextprime(3^n)-nextprime(2^n))/2.

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

Links

Table of n, a(n) for n=0..28.

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

Adjacent sequences: A037126 A037127 A037128 * A037130 A037131 A037132

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

More terms from Sean A. Irvine, Dec 09 2020

Status

approved