A056742 phi[(2^n - 1)]/2.

1, 3, 4, 15, 18, 63, 64, 216, 300, 968, 864, 4095, 5292, 13500, 16384, 65535, 69984, 262143, 240000, 889056, 1320352, 4105040, 3317760, 16200000, 22358700, 56733696, 66382848, 266913216, 267300000, 1073741823, 1073741824

Offset

2,2

Links

Table of n, a(n) for n=2..32.

Mathematica

Table[EulerPhi[(2^n - 1)]/2, {n, 2, 40}]

Crossrefs

Cf. A011260.

Sequence in context: A136641 A325186 A053359 * A338123 A041435 A136210

Adjacent sequences: A056739 A056740 A056741 * A056743 A056744 A056745

Keyword

nonn

Author

Robert G. Wilson v, Aug 14 2000

Status

approved