329175

Appears in sequences

• Triangle giving T(n,k) = number of (n,k) labeled rooted Greg trees (n >= 1, 0<=k<=n-1).at n=25A048160
• Numbers k such that k = (2*d_1 + 1)*(2*d_2 + 1)*...*(2*d_m + 1) where d_1 d_2 ... d_m is the decimal expansion of k.at n=3A113856
• Numbers n for which 2n-1, 4n-1, 8n-1, 16n-1 and 32n-1 are primes.at n=23A124017
• Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1 and 10*k-1 are primes.at n=18A124488
• Numbers k such that 2*k-1, 4*k-1, 6*k-1, 8*k-1, 10*k-1 and 12*k-1 are primes.at n=3A124489
• Numbers n such that phi(n)=phi(n+5), with Euler's totient function phi=A000010.at n=14A179187
• a(n) is the least integer that can be expressed as the difference of two hexagonal numbers in exactly n ways.at n=16A334035
• a(n) is the smallest number that has exactly n evil divisors (A001969).at n=47A356019