login
Composites whose digit length is equal to their number of prime factors (counted with multiplicity).
3

%I #14 Oct 26 2020 09:03:54

%S 10,14,15,21,22,25,26,33,34,35,38,39,46,49,51,55,57,58,62,65,69,74,77,

%T 82,85,86,87,91,93,94,95,102,105,110,114,116,117,124,125,130,138,147,

%U 148,153,154,164,165,170,171,172,174,175,182,186,188,190,195,207

%N Composites whose digit length is equal to their number of prime factors (counted with multiplicity).

%H Carlos Rivera, <a href="http://www.primepuzzles.net/puzzles/puzz_025.htm">Composed primes</a>, The Prime Puzzles and Problems Connection.

%Y Cf. A036335, A036336, A036337.

%K nonn,base

%O 1,1

%A _Patrick De Geest_, Dec 15 1998

%E 1 removed by _Sean A. Irvine_, Oct 26 2020