282930domain: NAppears in sequencesDecimal concatenation of n, n+1, and n+2.at n=28A001703Duplicate of A001703.at n=28A127422Concatenate (3n-2,3n-1,3n).at n=9A248556List the positive integers but erase commas between terms if the digits just before and just after the comma have the same parity.at n=18A365822