106425

Appears in sequences

• Odd hexagonal pyramidal numbers.at n=27A015225
• Odd numbers k such that abs(sigma(k)-2k) <= sqrt(k). Abundance-radius = abs(sigma(k)-2k) does not exceed square root of k and k is odd.at n=34A087415
• Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1 and 32*k+1 are primes.at n=15A124413
• Odd numbers n such that 2n/sigma(n) - 1 = 1/x for some positive integer x.at n=28A222263
• Number of connected multiset partitions of normal multisets of size n.at n=9A317077
• Deficient numbers k > 1 such that k*p is abundant for all primes p dividing k.at n=13A341358
• Numbers that are divisible by the squares of two distinct primes and whose arithmetic derivative (A003415) is a squarefree number of the form 4k+2.at n=33A368697