OFFSET
1,5
COMMENTS
The Mobius transform of this sequence yields A057955, number of prime factors of 6^n-1.
REFERENCES
See references at A085021
LINKS
Max Alekseyev, Table of n, a(n) for n = 1..420
MATHEMATICA
Table[Plus@@Transpose[FactorInteger[Cyclotomic[n, 6]]][[2]], {n, 1, 100}]
CROSSREFS
KEYWORD
nonn
AUTHOR
T. D. Noe, Jun 19 2003
STATUS
approved