A096855 a(n) = A062401(2^n + 1).

2, 2, 2, 12, 6, 16, 24, 80, 84, 320, 360, 864, 1320, 5456, 5184, 15744, 19800, 52800, 69120, 349520, 370080, 1036800, 1425600, 3640896, 4741632, 13989888, 27091584, 76743040, 94656000, 166387200, 412473600, 1407389952, 1420488192, 3459760128, 6502788864, 14778408960

Offset: 0

Author

Labos Elemer, Jul 19 2004

Keywords

• nonn

Links

• Amiram Eldar, Table of n, a(n) for n = 0..400

Crossrefs

Cf. A000010, A062401, A062402, A053287, A096853, A069061, A096854, A096855, A096856.

Programs

Mathematica

Table[ EulerPhi[ DivisorSigma[1, 2^n+1]], {n, 0, 33}]

Formula

a(n) = A000010(A069061(n)). - Amiram Eldar, Jun 04 2024

Extensions

Edited and extended by Robert G. Wilson v, Jul 23 2004

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