280380

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=2A098188
• Expansion of (4*x^2+x-1)/(12*x^3+4*x^2+x-1).at n=12A147833
• Unitary sociable numbers of order 4.at n=2A319902