A113773 Number of distinct prime factors of A008352.

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

Offset

1,2

Comments

a(13) >= 11.

Links

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

Example

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

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

Crossrefs

Cf. A008352.

Sequence in context: A362251 A165120 A165129 * A060749 A138305 A169897

Adjacent sequences: A113770 A113771 A113772 * A113774 A113775 A113776

Keyword

more,hard,nonn,base

Author

Parthasarathy Nambi, Jan 19 2006

Extensions

More terms from Sean A. Irvine, Feb 22 2011

Status

approved