OFFSET
0,1
COMMENTS
f(x) = sum of prime factors with multiplicity, so that f(1500) = 2+2+3+5+5+5 = 22.
Identical to the different-offset A121360 except for the second term. - Hans Havermann, Oct 05 2010
a(20) <= 536226160966. a(21) <= 2681130804805. a(22) <= 8512643845707. - Donovan Johnson
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(17) from Donovan Johnson, Apr 25 2010
Edited comment and a(18)-a(19) from Donovan Johnson, Oct 16 2010
STATUS
approved