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A091262 Sum of totient function values of powers of n, as exponent runs from 1 to n. 0
1, 3, 26, 170, 3124, 18662, 823542, 9586980, 290565366, 4444444444, 285311670610, 3242218344820, 302875106592252, 5128618534872930, 250225080217633928, 9838263505978427528, 827240261886336764176, 13886967555987013261914 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..18.

FORMULA

a(n) = ((n^n-1)/(n-1))*phi(n), n>1. - Vladeta Jovovic, Feb 28 2004

MATHEMATICA

Table[Apply[Plus, Table[EulerPhi[m^j], {j, 1, m}]], {m, 1, 15}]

CROSSREFS

Cf. A000010.

Sequence in context: A121626 A038697 A226351 * A121121 A228116 A091123

Adjacent sequences:  A091259 A091260 A091261 * A091263 A091264 A091265

KEYWORD

nonn

AUTHOR

Labos Elemer, Feb 12 2004

EXTENSIONS

More terms from Robert G. Wilson v, Feb 12 2004

STATUS

approved

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Last modified December 8 09:32 EST 2019. Contains 329862 sequences. (Running on oeis4.)