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A291373
a(n) is the smallest number k such that A001065(k) = A002110(n), or 0 if no such k exists.
0
2, 0, 6, 841, 0, 1722, 30018, 0
OFFSET
0,1
COMMENTS
a(10) = 4057230930. - Giovanni Resta, Aug 23 2017
FORMULA
a(n) = A070015(A002110(n)). - Michel Marcus, Aug 25 2017
EXAMPLE
a(5) = 1722 because sigma(1722) - 1722 = 2*3*5*7*11 = A002110(5) and 1722 is the least number with this property.
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Altug Alkan, Aug 23 2017
EXTENSIONS
a(7) confirmed by Giovanni Resta, Aug 23 2017
STATUS
approved