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A069925 phi(2^n+1)/2n. 0
1, 1, 1, 2, 2, 4, 6, 16, 18, 40, 62, 160, 210, 448, 660, 2048, 2570, 5184, 9198, 24672, 32508, 76032, 121574, 344064, 405000, 1005888, 1569780, 4511520, 6066336, 12672000, 23091222, 67004160, 85342752, 200422656, 289531200, 892477440 (list; graph; refs; listen; history; internal format)
OFFSET

1,4

MATHEMATICA

Table[EulerPhi[2^n+1]/(2n), {n, 50}] (* From Harvey P. Dale, Nov 15 2011 *)

CROSSREFS

Cf. A011260.

Sequence in context: A116637 A153961 A134041 * A080611 A171421 A072707

Adjacent sequences:  A069922 A069923 A069924 * A069926 A069927 A069928

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Apr 25 2002

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Last modified February 15 03:59 EST 2012. Contains 205694 sequences.