66226domain: NAppears in sequencesa(n) = Sum_{j=1..n} prime(j)*2^(j-2).at n=11A135483a(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=18A143192