A113773 Number of distinct prime factors of A008352.

1, 2, 2, 3, 3, 5, 2, 5, 6, 9, 5, 7

Offset: 1

Author

Parthasarathy Nambi, Jan 19 2006

Keywords

• more
• hard
• nonn
• base

Comments

a(13) >= 11.

Examples

			The number of distinct prime factors of 212 is 2 which is the third term in the sequence.
		

Crossrefs

Cf. A008352.

Programs

Maple

catL := proc(a,b) a*10^(max(1,ilog10(b)+1))+b ; end: A008352 := proc(n) option remember ; if n <= 1 then n+1 ; else catL( A008352(n-2),A008352(n-1)) ; fi ; end: A113773 := proc(n) nops( numtheory[factorset](A008352(n))) ; end: for n from 1 do print(A113773(n)) ; od: # R. J. Mathar, Feb 06 2008

Extensions

More terms from Sean A. Irvine, Feb 22 2011