56536
domain: N
Appears in sequences
- a(n) is the least multiple of n, k*n say, such that phi(k) | sigma(k).at n=36A015756
- Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and sigma(n) are all integers.at n=25A065146
- Numbers k such that sigma(k) = 4*phi(k).at n=20A068390
- Numbers k such that sigma(k) = phi(k*bigomega(k)).at n=21A068400
- 6-step Fibonacci sequence starting with (0,0,0,1,0,0).at n=22A251707
- Numbers of the form x = 2^k*p*q, p,q odd primes, such that sigma(x)/phi(x) = 4.at n=6A292422
- Integers n such that sigma(n)/phi(n) is a perfect square.at n=37A293391
- Number of palindromic binary strings of length n having no 6-runs of 1's.at n=31A382479