A109829 - OEIS

A109829

Number of distinct prime factors of 149 - (n-th prime power less than 149).

2, 2, 2, 2, 2, 2, 2, 3, 3, 2, 2, 3, 3, 3, 2, 2, 3, 2, 2, 2, 2, 2, 3, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 3, 3, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2

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

OFFSET

1,1

COMMENTS

a(n) > 1: A071331(2) = 149, A071330(149) = 0.

LINKS

FORMULA

a(n) = 149 - A000961(n) for n <= 48.

MATHEMATICA

Join[{2}, PrimeNu/@(149-Select[Range[0, 148], PrimePowerQ])] (* Harvey P. Dale, Jan 27 2019 *)

CROSSREFS

KEYWORD

nonn,fini,full

AUTHOR

STATUS

approved