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1,3
Table of n, a(n) for n=1..89.
For n>7 a(3n)=a(n)+2; a(3n+1)=a(n)+3; (3n+2)=a(n)+4
(PARI) a(n)=if(n<2, 1, n-2*valuation(n!*sum(i=1, n, 1/i), 3))
Cf. A056792.
Sequence in context: A144786 A247369 A009389 * A121845 A239639 A099816
Adjacent sequences: A091825 A091826 A091827 * A091829 A091830 A091831
nonn
Benoit Cloitre, Mar 09 2004
approved