722701
domain: N
Appears in sequences
- Base 9 digits are, in order, the first n terms of the periodic sequence with initial period 1,3,2.at n=6A037616
- Primitive numbers k that divide sigma(k)*phi(k).at n=24A055196
- Triangle read by rows: Stirling2 triangle with scaled diagonals (powers of 7).at n=23A075502
- Third column of triangle A075502.at n=4A075922
- 7th binomial transform of (1,6,0,0,0,0,0,0,...).at n=6A081042
- Integers k such that k + phi(k) + phi(phi(k)) is a fourth power.at n=32A116041