81818181

Appears in sequences

• List of numbers k whose consecutive digits increase or decrease by d-1, where d is the number of digits in k.at n=125A292439
• a(n) = number of times n appears in the sequence (b(i)[1], i=1,2,3,4,...), where b(i) is defined in A318919.at n=10A318920
• Terms of A338039 that are repeated concatenations of smaller integers.at n=28A338166