A073129 Partial sums of cototients arising in A063986.

0, 4, 5, 120, 125, 12201, 70800, 74657, 29526432, 37132574, 89210424, 124777688, 120392102955, 48617257062792, 343289046464505, 7519663359716376, 1214022599940709056, 40644839476190305216, 87437200646372849005, 98628693371623948080, 375871306587181970568

Offset

1,2

Links

Table of n, a(n) for n=1..21.

Formula

a(n)=Sum[cototient[j], j=1..A063986(n)]

Example

n=15, a(15)=343289046464505, sum of first 41846733 cototients A063986(15)*A073128(15)=a(15) To continue A063986, A073128 or A073129 without recomputing previous terms, corresponding entries from 2 of above sequences is required.

Crossrefs

Cf. A051953, A000010, A002088, A048920, A000217, A050226, A073128, A063986.

Sequence in context: A052320 A079197 A113942 * A270551 A041409 A101076

Adjacent sequences: A073126 A073127 A073128 * A073130 A073131 A073132

Keyword

nonn

Author

Labos Elemer, Jul 16 2002

Extensions

Changed A063896 to A063986 and a(16)-a(21) from Donovan Johnson, May 11 2010

Status

approved