1,6

Table of n, a(n) for n=1..88.

a(n)=A133900(n)/n^2.

a(n)=1, iff n is a prime or a power of a prime (including n=1).

If a prime p is a factor of a(n), then p is also a factor of n.

a(6)=2, since A133900(6)/6^2=72/36=2.

a(18)=8, since A133900(18)/18^2=2592/324=8.

Cf. A000040, A100118, A046363, A133620, A133621, A133623, A133630, A133635.

Cf. A133872, A133880, A133890, A133900, A133911.

Sequence in context: A306671 A308210 A112331 * A066441 A300384 A252890

Adjacent sequences: A133907 A133908 A133909 * A133911 A133912 A133913

nonn

Hieronymus Fischer, Oct 20 2007

approved