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A069637 Number of prime powers <= n with exponents >1. 5
0, 0, 0, 1, 1, 1, 1, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

COMMENTS

Counts A025475 without 1=prime^0: a(n)=A085501(n)-1. - Reinhard Zumkeller, Jul 03 2003

LINKS

Daniel Forgues, Table of n, a(n) for n=1,...,100000.

FORMULA

a(n) = A025528(n) - A000720(n) = A000720([n^(1/2)]) + A000720([n^(1/3)]) + ... . - Max Alekseyev, May 11 2009

CROSSREFS

Sequence in context: A102680 A025791 A237115 * A072292 A243282 A093390

Adjacent sequences:  A069634 A069635 A069636 * A069638 A069639 A069640

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Mar 27 2002

STATUS

approved

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Last modified February 22 07:43 EST 2018. Contains 299447 sequences. (Running on oeis4.)