A037133 (nextprime(5^n)-nextprime(2^n))/2.

0, 2, 12, 58, 307, 1550, 7781, 39003, 195195, 976315, 4882299, 24413043, 122068292, 610347461, 3051749613, 15258772698, 76293912556, 381469661013, 1907348501745, 9536742901936, 47683715296045, 238418578052990, 1192092893410662, 5960464473344773

Offset

0,2

Links

Table of n, a(n) for n=0..23.

Formula

a(n) = A037132(n) / 2. - Sean A. Irvine, Dec 09 2020

Mathematica

Table[(NextPrime[5^n]-NextPrime[2^n])/2, {n, 0, 30}] (* Harvey P. Dale, Apr 14 2023 *)

Crossrefs

Sequence in context: A285364 A282435 A001758 * A009618 A143770 A062478

Adjacent sequences: A037130 A037131 A037132 * A037134 A037135 A037136

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

More terms from Sean A. Irvine, Dec 09 2020

Status

approved