23091222
domain: N
Appears in sequences
- a(n) = phi(2^n+1)/(2*n).at n=30A069925
- Unique prime factors of 2^n+1 are of the form kn+1. These are the values for k.at n=39A098268
- a(n) = ((2^prime(n+2)-2)/prime(n+2))/3, where n >= 1.at n=8A145756
- Number of 2-elements orbits of S3 action on irreducible polynomials of degree 3n, n > 0, over GF(2).at n=30A165920
- Least positive number k such that k*p+1 divides 2^p+1 where p is prime(n), or 0 if no such number exists.at n=10A185343
- Sets with a congruence property.at n=14A262590