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A153078
Number of values of m such that sigma(m) = A002110(n) where A002110(n) is the product of the first n primes.
2
0, 1, 1, 2, 2, 5, 2, 4, 5, 3, 7, 5, 10, 2, 8, 4, 5, 6, 11, 32, 42, 68, 24, 87
OFFSET
1,4
FORMULA
a(n) = A054973(A002110(n)). - Ray Chandler, Dec 28 2008
EXAMPLE
a(10) = 3 because 2388809736, 3450503048 and 3696967556 are the only numbers with a sigma value = A002110(10). A002110(10) = 6469693230 = 2*3*5*7*11*13*17*19*23*29.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Donovan Johnson, Dec 19 2008
EXTENSIONS
a(12)-a(21) from Ray Chandler, Dec 28 2008
a(22)-a(24) from Max Alekseyev, Jan 27 2012
STATUS
approved