18181818

Appears in sequences

• Numbers whose consecutive digits differ by 7.at n=40A048409
• Quadruplets: base 10 representation is the juxtaposition of four identical strings.at n=17A074843
• Least numbers x such that the ratio of the sum of all the cyclic permutations of x, plus the unpermuted number, and x itself is equal to n.at n=21A247552
• List of numbers k whose consecutive digits increase or decrease by d-1, where d is the number of digits in k.at n=122A292439
• Numbers k such that k multiplied by the sum of reciprocals of digits is the digit reversal of k.at n=31A309654
• Terms of A338039 that are repeated concatenations of smaller integers.at n=17A338166