712800

Appears in sequences

• Numbers k such that phi(sigma(k)) = k.at n=10A001229
• Numbers k such that k = phi(sigma(phi(sigma(k)))).at n=24A067883
• Numbers k such that k = phi(sigma(phi(sigma(phi(sigma(k)))))).at n=25A067884
• a(n) = number of elements of order n in simple group Alt(11) of order 19958400.at n=13A145822
• Number of partitions of the (n+6)-multiset {0,...,0,1,2,...,6} with n 0's.at n=11A346859
• Expansion of e.g.f. exp( Sum_{k>=0} x^(5*k+2) / (5*k+2) ).at n=11A365972
• a(n) is the denominator of the probability that the free polyomino with binary code A246521(n+1) appears in the version of the Eden growth model described in A367671 when n square cells have been added.at n=49A367672
• Numbers which are the minimum of a cycle in the map x -> phi(sigma(x)).at n=27A376256
• Number of matchings in the complete planted binary tree with 2^n leaves.at n=4A377936
• Positive integers k such that the set {d+k/d : d|k} contains four consecutive integers.at n=1A386303