A096856 a(n) = A062402(2^n+1).

1, 3, 7, 12, 31, 42, 124, 224, 511, 847, 1953, 2688, 12264, 18816, 29127, 72540, 131071, 195048, 558523, 1077440, 3164112, 4552020, 10890040, 10342080, 54525848, 73260781, 155671040, 318848400, 1080311232, 964580240, 3070642080, 4340711424, 13722819600, 19039027200

Offset: 0

Author

Labos Elemer, Jul 19 2004

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 0..372

Crossrefs

Cf. A000203, A053285, A062401, A062402, A053287, A096853, A096854, A096855.

Programs

Mathematica

Table[DivisorSigma[1, EulerPhi[2^n + 1]], {n, 0, 30}]

Formula

a(n) = A000203(A053285(n)). - Amiram Eldar, Jun 04 2024

Extensions

Offset changed to 0, a(0) prepended and three more terms added by Amiram Eldar, Jun 04 2024