169169

Appears in sequences

• Concatenations of two squares in two ways.at n=19A038670
• Numbers that are in more than one way the concatenation of the decimal representation of two nonzero squares.at n=19A192993
• a(n) = concatenation of n^2 with itself.at n=12A253445
• After a(1) = 1, the sequence is always extended with the smallest divisor d (not yet present in the sequence) of the last term t. If d doesn't exist, we extend the sequence with tt (t concatenated to itself). If tt doesn't produce a new d, we extend the sequence with ttt, etc. See the Comments section for more details.at n=54A348871