19303
domain: N
Appears in sequences
- Counterbalanced numbers: Composite numbers k such that phi(k)/(sigma(k)-k) is an integer.at n=21A055940
- Numbers k such that sopf(k) = 2*sopf(k+1), where sopf(k) = A008472.at n=24A064112
- Number of 8k+-3 primes (A003629) in range [2^n,2^(n+1)].at n=18A095014
- Numbers n such that P(4n) is prime, where P(m) is the number of partitions of m.at n=44A111045
- Partial sum of Catalan numbers A000108 multiplied by powers of 6.at n=4A112700
- Triangle built from partial sums of Catalan numbers A000108 multiplied by powers.at n=61A112705
- Smallest k such that 41^k mod k = n.at n=38A178202
- Numbers k such that phi(k) > phi(k+1) > phi(k+2) > phi(k+3) where phi is the Euler totient function (A000010).at n=32A326817
- Number of partitions of [3n] into 3 sets of size n having at least one set of consecutive numbers whose maximum (if n>0) is a multiple of n.at n=8A370487