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A036335 Total number of composite numbers with n digits and n prime factors (counted with multiplicity). 4
0, 31, 225, 1563, 10222, 63030, 374264, 2160300, 12196405, 67724342, 371233523, 2014305995 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Essentially the same as A124033.

LINKS

Table of n, a(n) for n=1..12.

C. Rivera, Related puzzle

EXAMPLE

a(1) = 0, since any single-digit number with 1 prime factor is a prime!

CROSSREFS

Cf. A036336-A036338.

Sequence in context: A256172 A142939 A229018 * A075931 A142440 A075932

Adjacent sequences:  A036332 A036333 A036334 * A036336 A036337 A036338

KEYWORD

nonn,base

AUTHOR

Patrick De Geest, Dec 15 1998

EXTENSIONS

One more term from Naohiro Nomoto, Jul 31 2001

a(9)-a(12) from Ray Chandler, Apr 12 2011

STATUS

approved

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Last modified October 1 08:39 EDT 2020. Contains 337442 sequences. (Running on oeis4.)