OFFSET

1,2

EXAMPLE

a(7) = 5 as 1, 2, 3, 5 and 7 qualify for the count.

MATHEMATICA

Do[s = 0; For[i = 1, i <= n, i++, If[DivisorSigma[0, i] <= DivisorSigma[0, n], s++ ]]; Print[s], {n, 1, 50}] (* Ryan Propper, Mar 30 2006 *)

PROG

(PARI) for(n=1, 200, m=0; sn=sigma(n, 0); for(i = 1, n, if(sigma(i, 0)<=sn, m++)); print1(m", ")) \\ Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 28 2007

CROSSREFS

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Feb 03 2003

EXTENSIONS

More terms from Ryan Propper, Mar 30 2006

More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Apr 28 2007

STATUS

approved