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A056820 Euler totient function of Cullen numbers (A002064), n*2^n +1. 0
1, 2, 6, 20, 48, 132, 240, 528, 1364, 4180, 7560, 20784, 42768, 70992, 151632, 446208, 986880, 1688400, 4006800, 6080256, 13843440, 42125380, 79567488, 152712000, 292573440, 526051328, 797636448, 2942476992, 7257012896 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

MATHEMATICA

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

CROSSREFS

Cf. A002064.

Sequence in context: A139115 A193538 A121128 * A204422 A027558 A066397

Adjacent sequences:  A056817 A056818 A056819 * A056821 A056822 A056823

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 31 2000

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Last modified February 17 07:41 EST 2012. Contains 205998 sequences.