A085033 - OEIS

A085033

Number of prime factors of cyclotomic(n,8), which is A019326(n), the value of the n-th cyclotomic polynomial evaluated at x=8.

1, 2, 1, 2, 2, 2, 3, 2, 1, 2, 3, 2, 3, 2, 2, 3, 4, 2, 3, 4, 2, 3, 3, 2, 4, 2, 3, 4, 5, 1, 2, 3, 3, 4, 5, 2, 5, 3, 4, 2, 4, 1, 4, 4, 3, 3, 5, 2, 3, 3, 2, 8, 7, 4, 4, 3, 2, 3, 5, 3, 4, 3, 2, 3, 2, 2, 5, 7, 4, 5, 6, 2, 6, 5, 4, 6, 3, 1, 7, 3, 4, 5, 4, 2

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

The Mobius transform of this sequence yields A057953, number of prime factors of 8^n-1.

REFERENCES

See references at A085021

LINKS

Max Alekseyev, Table of n, a(n) for n = 1..500

MATHEMATICA

Table[Plus@@Transpose[FactorInteger[Cyclotomic[n, 8]]][[2]], {n, 1, 100}]

CROSSREFS

omega(Phi(n,x)): A085021 (x=2), A085028 (x=3), A085029 (x=4), A085030 (x=5), A085031 (x=6), A085032 (x=7), this sequence (x=8), A085034 (x=9), A085035 (x=10).

Cf. A019326, A057953, A059890, A274908.

Sequence in context: A144590 A057368 A192394 * A230254 A299484 A327007

Adjacent sequences: A085030 A085031 A085032 * A085034 A085035 A085036

KEYWORD

nonn

AUTHOR

T. D. Noe, Jun 19 2003

STATUS

approved