111331

Appears in sequences

• Numbers with multiplicative digital root value 9.at n=39A034056
• a(n) is the concatenation of n with n^3.at n=10A061086
• 6-digit numbers k such that: (a) the digits of k are from the set {1, 2, 3, 4, 5}, and (b) any digit that appears in k appears at least twice.at n=9A171725
• Composite numbers whose multiplicative digital root is 9.at n=31A201024
• Maximal nonempty {1,3}-chunks of a 4-day-old string in a "Look and Say" sequence.at n=27A244047
• a(n) = a(n-1) + a(n-2) + 2 a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=22A298346
• Square array T(n,k), n>0 and k>0, read by antidiagonals in ascending order, giving the smallest n*k-digit number that, if arranged in an n X k matrix, form k-digit reversible prime in each row and n-digit reversible prime in each column, or -1 if no such number exists.at n=7A375171