1705636
domain: N
Appears in sequences
- Squares whose sum of divisors is a square.at n=4A008848
- Duplicate of A008848.at n=4A074387
- Numbers n such that both sigma(n) and sigma(sigma(n)) are odd numbers.at n=6A097025
- Perfect (or pure) powers pp such that sigma(pp) is also a perfect (pure) power.at n=5A128607
- Sigma-powerful numbers: powerful numbers n such that sigma(n) is also powerful. An incomplete version of A337045.at n=3A180090
- Squares whose arithmetic mean of digits is 4 (i.e., the sum of digits is 4 times the number of digits).at n=29A316484
- Numbers k such that both k and sigma(k)=A000203(k) are powerful, i.e., are terms of A001694.at n=11A337044
- Indecomposable sigma-powerful numbers: powerful numbers k such that sigma(k) is also powerful, but restricted to terms that are not the product of 2 terms > 1 of A337044.at n=7A337045