A379916 a(n) is the deficiency of A046389(n), divided by 2.

9, 21, 27, 39, 39, 49, 45, 57, 69, 97, 79, 93, 75, 119, 81, 99, 99, 129, 163, 129, 111, 147, 117, 139, 159, 185, 129, 211, 181, 183, 169, 147, 229, 189, 165, 225, 199, 171, 287, 237, 249, 219, 329, 189, 295, 255, 325, 201, 317, 207, 349, 249, 291, 309, 225, 313

Offset

1,1

Links

Hugo Pfoertner, Table of n, a(n) for n = 1..10000

Formula

a(n) = (2*A046389(n) - sigma(A046389(n))/2, where sigma is A000203.

a(n) = (A033879(A046389(n))/2.

Prog

(PARI) \\ uses function a379915_17 from A379917
a379915_17(1210, 3)

Crossrefs

Cf. A000203, A033879, A046389, A379915, A379917.

Sequence in context: A053795 A100490 A173250 * A128462 A186815 A106214

Adjacent sequences: A379913 A379914 A379915 * A379917 A379919 A379920

Keyword

nonn,new

Author

Hugo Pfoertner, Jan 06 2025

Status

approved