1001021domain: NAppears in sequencesLexicographically earliest strictly increasing base 6 autovarious sequence: a(n) = number of distinct a(k) mod 6^n (written in base 6).at n=31A038115Non-Niven (or non-Harshad) numbers that are divisible by the square of the sum of the squares of their digits.at n=25A379981