81913

Appears in sequences

• a(n) is the smallest natural number we cannot obtain from n, n+1, n+2, n+3, n+4, n+5, n+6, n+7 and the operators +, -, *, /, using each number only once.at n=23A143192
• Numbers that are both binary palindromes and binary Niven numbers.at n=8A334529