1,2

Essentially the same as A124033.

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

C. Rivera, Related puzzle

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

Cf. A036336-A036338.

Sequence in context: A256172 A142939 A229018 * A075931 A142440 A075932

Adjacent sequences: A036332 A036333 A036334 * A036336 A036337 A036338

nonn,base

Patrick De Geest, Dec 15 1998

One more term from Naohiro Nomoto, Jul 31 2001

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

approved