OFFSET
1,2
LINKS
Logan J. Kleinwaks, Table of n, a(n) for n = 1..250
EXAMPLE
Let s(n) be the sum of the divisors of n. a(3)!=3 because s(1+3)=s(2+2)=7. a(3)=4 because s(1+1)=3, s(1+2)=4, s(1+4)=6, s(2+2)=7, s(2+4)=12, and s(4,4)=15 are all distinct.
CROSSREFS
KEYWORD
nonn
AUTHOR
Logan J. Kleinwaks, Oct 11 2017
STATUS
approved