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A177196 Number of distinct representations of A163143(n) as a "zipper number". 2
1, 1, 1, 1, 1, 1, 2, 4, 1, 1, 1, 5, 1, 1, 1, 2, 1, 1, 6, 1, 1, 1, 1, 5, 1, 1, 1, 1, 1, 1, 3, 4, 1, 1, 1, 2, 1, 5, 1, 1, 1, 1, 2, 3, 3, 2, 2, 2, 1, 1, 1, 1, 8, 2, 2, 1, 1, 1, 4, 1, 1, 1, 1, 1, 1, 2, 3, 1, 1, 1, 1, 2, 12, 1, 1, 1, 2, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 4, 2, 1, 1, 1, 1, 1, 1, 1, 3, 2, 10, 4, 1, 2, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,7

COMMENTS

See A163143 for definition of "zipper number".

LINKS

Ray Chandler, Table of n, a(n) for n=1..253

Ray Chandler, Distinct representations of "zipper numbers" less than 1000.

EXAMPLE

a(7)=2 since A163143(7) = 44 = 2^1*22^1 = 4^1*11^1.

a(8)=4 since A163143(8) = 48 = 2^3*6^1 = 3^1*16^1 = 2^1*2^3*3^1 = 2^2*2^2*3^1.

CROSSREFS

Cf. A163143.

Sequence in context: A059817 A099803 A247645 * A010741 A094643 A094593

Adjacent sequences:  A177193 A177194 A177195 * A177197 A177198 A177199

KEYWORD

nonn,base

AUTHOR

Ray Chandler, May 04 2010

STATUS

approved

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Last modified August 9 14:27 EDT 2020. Contains 336323 sequences. (Running on oeis4.)