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A062537 Nodes in riff (rooted index-functional forest) for n. 31
0, 1, 2, 2, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 3, 4, 4, 4, 5, 5, 5, 4, 5, 4, 5, 4, 5, 5, 6, 5, 4, 6, 5, 6, 5, 5, 5, 6, 6, 5, 6, 5, 6, 6, 5, 6, 5, 4, 5, 6, 6, 4, 5, 7, 6, 6, 6, 5, 7, 5, 6, 6, 4, 7, 7, 5, 6, 6, 7, 6, 6, 6, 6, 6, 6, 7, 7, 6, 6, 4, 6, 5, 7, 7, 6, 7, 7, 6, 7, 7, 6, 7, 7, 7, 6, 5, 5, 7, 6, 6, 7, 5, 7, 8 (list; graph; refs; listen; history; internal format)
OFFSET

1,3

COMMENTS

A061396(n) gives number of times n appears in this sequence.

LINKS

J. Awbrey, Illustrations of riffs for small integers

FORMULA

a(Prod(p_i^e_i)) = Sum(a(i)+a(e_i)+1), product over nonzero e_i in prime factorization.

CROSSREFS

Sequence in context: A072643 A130260 A111393 * A097688 A171895 A025785

Adjacent sequences:  A062534 A062535 A062536 * A062538 A062539 A062540

KEYWORD

nonn,easy,nice

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net), Jun 25, 2001

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.