OFFSET
1,1
FORMULA
If d'(k) is the number of divisors of k minus 1 for square k and minus 2 for numbers of the form m^2+m, then a(n) is the first k for which d'(k)/2>n-1.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
James G. Merickel, Dec 16 2009
STATUS
approved