263940

Appears in sequences

• Irregular triangle with 4 columns which contains in each row the members of a 4-cycle under the map x->A063919(x), iteration of summing the proper-unitary divisors.at n=1A098188
• a(n) = (1/4)*(n^2 - 2*n)^2 + (9/4)*(n^2 - 2*n) + 6.at n=32A294070
• Unitary sociable numbers of order 4.at n=1A319902