A237709 Number of occurrences of n-th prime power in A188666.

1, 2, 2, 2, 2, 4, 2, 2, 4, 4, 6, 2, 4, 8, 4, 4, 4, 4, 2, 10, 8, 4, 8, 4, 8, 12, 4, 6, 6, 8, 4, 12, 4, 4, 12, 16, 8, 4, 8, 4, 8, 16, 8, 4, 2, 6, 12, 4, 20, 4, 12, 12, 8, 4, 8, 12, 4, 20, 4, 8, 4, 24, 24, 8, 4, 8, 12, 4, 4, 16, 10, 2, 12, 12, 4, 12, 8, 4, 12

Offset

1,2

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Example

A188666: 1 2 2 3 3 4 4 5 5 7 7 7 7 8 8 9 9 11 11 11 11 13 13 13 13 16 ...
A237709: 1   2   2   2   2       4   2   2           4           4

Prog

(Haskell)
import Data.List (group)
a237709 n = a237709_list !! (n-1)
a237709_list = map length $ group a188666_list

Crossrefs

Cf. A000961, A138929.

Sequence in context: A366536 A349355 A353589 * A250200 A097859 A028326

Adjacent sequences: A237706 A237707 A237708 * A237710 A237711 A237712

Keyword

nonn

Author

Reinhard Zumkeller, Feb 12 2014

Status

approved