

A119240


Least odd number k such that sigma(k)/k >= n.


7




OFFSET

1,2


COMMENTS

These numbers are a subset of the oddly superabundant numbers, A119239. Laatsch mentions a(3). Pettigrew computes a(4) and a(5), the latter being a 123digit number.
Pettigrew (link, Tableau 5, p. 21) gives a(5) as 3^6*5^4*7^3*11^2*13^2*17^2*19*...*277.  Jeppe Stig Nielsen, Jul 03 2017


LINKS

Jeppe Stig Nielsen, Table of n, a(n) for n = 1..5
Richard Laatsch, Measuring the abundancy of integers, Mathematics Magazine 59 (2) (1986) 8492.
Walter Nissen, Abundancy : Some Resources
Steve Pettigrew, Sur la distribution de nombres spéciaux consécutifs, M.Sc. Thesis, Univ. Laval, 2000.


CROSSREFS

Cf. A023199 (least number k such that sigma(k)/k >= n).
Sequence in context: A263889 A133353 A322252 * A257722 A093247 A248785
Adjacent sequences: A119237 A119238 A119239 * A119241 A119242 A119243


KEYWORD

nonn


AUTHOR

T. D. Noe, May 09 2006


STATUS

approved



