404142

Appears in sequences

• Let S = 123456789101112131415..., the concatenation of the natural numbers; partition this string into distinct squarefree numbers. To avoid leading zeros, no number may end at the digit that comes before a 0 in S.at n=27A085943
• Concatenate the consecutive increasing numbers starting with Harshad(n) and ending with Harshad(n+1).at n=18A112131
• Concatenate (3n-2,3n-1,3n).at n=13A248556