66771domain: NAppears in sequencesa(n) is the solution to the postage stamp problem with 5 denominations and n stamps.at n=29A001210Odd numbers k such that A173557(k) = A173557(sigma(k)), where A173557(n) is multiplicative with a(p^e) = p-1 and sigma is the sum of divisors function.at n=48A387159