63855

Appears in sequences

• Number of degree-n even permutations of order exactly 2.at n=11A048099
• Third partial sums of fourth powers (A000583).at n=8A101090
• a(n) = number of elements of order n in simple group Alt(12) of order 239500800.at n=1A145437
• Numbers n such that n+/-2 and n^2+/-2 are all primes.at n=26A189051
• Odd numbers n such that 2n/sigma(n) - 1 = 1/x for some positive integer x.at n=25A222263
• Terms of A222263 such that 2n/sigma(n) - 1 = 1/2^k, for some integer k.at n=10A230166
• Members of a pair (m,k) such that sigma(m) = sigma(k) = sigma(m+k), m < k where sigma = A000203.at n=27A239436
• Composite k for which lcm(k, phi(k)) + lcm(k, tau(k)) = lcm(k, sigma(k)).at n=6A328651
• Odd numbers k that are closer to being perfect than previous terms and also satisfy the condition that A324644(k)/A324198(k) = 2.at n=8A386422