A153804 - OEIS

A153804

a(n) = A153801(n)/2.

0, 0, 0, 0, 1, 2, 1, 6, 19, 30, 38, 45, 240, 282, 616, 1075, 1111, 1578, 2093, 2176, 4808, 4931, 5565, 9924, 10802, 11554, 22197, 43068, 55197, 65968, 107982, 378354, 429648, 628824, 699060, 1488035, 1510610, 3486215, 6733375, 10497919, 12018202, 12982385, 15201133

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OFFSET

1,6

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..48

FORMULA

a(n) = (A000043(n) - A000040(n))/2.

MATHEMATICA

With[{max = 48}, (MersennePrimeExponent[Range[max]] - Prime[Range[max]]) / 2] (* Amiram Eldar, Oct 21 2024 *)

CROSSREFS

Cf. A000040, A000043, A153800, A153801, A153802.

Sequence in context: A366356 A365109 A025271 * A239740 A375255 A371986