

A216897


a(n) = smallest m such that sigma(m)/m = n + 1/3.


0




OFFSET

1,1


COMMENTS

An upper bound for a(7) is a 77digit number with factorization: 2^35 3^20 5^9 7^3 11 13^2 17 19 23 29 31 37^2 41 61 67 71 73 109 137 409 521 547 1093 36809 368089.
An upper bound for a(8) is a 165digit number that can be found on given link where line begins with 25/3.


LINKS



EXAMPLE

a(1) = 3 because sigma(3)/3 = 4/3 = 1 + 1/3 and 3 is the earliest m such that sigma(m)/m = 1 + 1/3.


CROSSREFS



KEYWORD

nonn


AUTHOR



STATUS

approved



