373490domain: NAppears in sequencesSum of two powers of 13.at n=18A072390a(n) = n^5 + n^3.at n=13A155977Numbers k such that k, k + 1 and k + 2 are 3 consecutive Niven (Harshad) numbers that are also divisible by a square.at n=29A359839a(n) = n^3*sigma_2(n).at n=13A386746