61061domain: NAppears in sequencesa(n) = (n+1)*(n+2)*(n+3)*(n+4)*(7*n^2 + 20*n + 15)/360.at n=10A108683Numbers k such that the sum of the Carmichael lambda functions of the divisors is a proper divisor of k.at n=30A131492Cyclops octagonal numbers: a(n) = n*(3*n-2) with one "zero" digit in the middle.at n=9A285767