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A109829 Number of distinct prime factors of 149 - (n-th prime power less than 149). 2
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

Table of n, a(n) for n=1..48.

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

Sequence in context: A139326 A029243 A306240 * A054125 A177227 A174373

Adjacent sequences:  A109826 A109827 A109828 * A109830 A109831 A109832

KEYWORD

nonn,fini,full

AUTHOR

Reinhard Zumkeller, Jul 04 2005

STATUS

approved

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Last modified October 4 08:55 EDT 2022. Contains 357239 sequences. (Running on oeis4.)