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A078479
a(1)=1, a(n+1)=a(spf(n))+a(gpf(n)), where spf(n) and gpf(n) are the smallest and greatest prime factors of n (A020639, A006530).
0
1, 2, 4, 8, 4, 8, 6, 12, 4, 8, 6, 12, 6, 12, 8, 8, 4, 8, 6, 12, 6, 10, 8, 16, 6, 8, 8, 8, 8, 16, 6, 12, 4, 10, 6, 10, 6, 12, 8, 10, 6, 12, 8, 16, 8, 8, 10, 20, 6, 12, 6, 8, 8, 16, 6, 10, 8, 10, 10, 20, 6, 12, 8, 10, 4, 10, 8, 16, 6, 12, 8, 16, 6, 12, 8, 8, 8, 12, 8, 16, 6, 8, 8, 16, 8, 8, 10, 12
OFFSET
1,2
CROSSREFS
Sequence in context: A021805 A031401 A191333 * A060968 A323651 A151569
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jan 03 2003
STATUS
approved