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A073129
Partial sums of cototients arising in A063986.
1
0, 4, 5, 120, 125, 12201, 70800, 74657, 29526432, 37132574, 89210424, 124777688, 120392102955, 48617257062792, 343289046464505, 7519663359716376, 1214022599940709056, 40644839476190305216, 87437200646372849005, 98628693371623948080, 375871306587181970568
OFFSET
1,2
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.
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