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A153076
Smallest number m such that sigma(m) = A002110(n) where A002110(n) is the product of the first n primes.
5
5, 29, 104, 1538, 13842, 188424, 3249576, 101864576, 2388809736, 59720243400, 2571228006912, 85266458294400, 6038197537693842, 227036227417289064, 12129959730964036050, 606111287080086323712, 36186481977293685109248
OFFSET
2,1
LINKS
Ray Chandler, Max Alekseyev, Table of n, a(n) for n = 2..24
Max A. Alekseyev, Computing the Inverses, their Power Sums, and Extrema for Euler's Totient and Other Multiplicative Functions. Journal of Integer Sequences, Vol. 19 (2016), Article 16.5.2
FORMULA
EXAMPLE
a(9) = 101864576. Sigma(101864576) = A002110(9) = 223092870 = 2*3*5*7*11*13*17*19*23.
CROSSREFS
KEYWORD
nonn
AUTHOR
Donovan Johnson, Dec 19 2008
EXTENSIONS
Extended by Ray Chandler, Dec 28 2008
a(22)-a(24) added to b-file by Max Alekseyev, Jan 31 2012
STATUS
approved