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A175719
a(1) = 1, for n >= 2, a(n) = the smallest number m with (a(n-1) + 3) divisors.
2
1, 6, 36, 36864
OFFSET
1,2
FORMULA
A000005(a(n)) = a(n-1) + 3 for n >= 2.
EXAMPLE
a(3) = 36 = the smallest number with 6 + 3 = 9 divisors.
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Aug 15 2010
STATUS
approved