A091373 Number of numbers <= n having exactly as many prime factors as the value of their smallest prime factor.

0, 0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17

Offset

1,6

Comments

a(n) = #{m: A001222(m)=A020639(m), m<=n};

A091372(n) + a(n) + A091374(n) = n.

Links

Table of n, a(n) for n=1..83.

Crossrefs

Cf. A091376, A091371.

Sequence in context: A055679 A056172 A285881 * A197637 A235492 A226762

Adjacent sequences: A091370 A091371 A091372 * A091374 A091375 A091376

Keyword

nonn

Author

Reinhard Zumkeller, Jan 04 2004

Status

approved