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A054610 a(n) = Sum_{d|n} phi(d)*3^(n/d). 5
0, 3, 12, 33, 96, 255, 780, 2205, 6672, 19755, 59340, 177177, 532416, 1594359, 4785228, 14349525, 43053504, 129140211, 387441756, 1162261521, 3486844320, 10460357775, 31381236876, 94143178893, 282430082832, 847288610475 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..2095

FORMULA

a(n) = n * A001867(n).

a(n) = 3*A034754(n). - R. J. Mathar, May 18 2014

CROSSREFS

Column k=3 of A185651.

Sequence in context: A083725 A192972 A159228 * A183468 A196234 A117655

Adjacent sequences:  A054607 A054608 A054609 * A054611 A054612 A054613

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 16 2000

STATUS

approved

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Last modified October 21 16:25 EDT 2019. Contains 328302 sequences. (Running on oeis4.)