Sequencing Answer (3/26)

91

For those of you looking for a solidly mathematical answer, my apologies. As you may have guessed, the first digit in the two-digit number is 9. Each first digit is simply adding 1 to the previous first digit. The second digit is how many enclosed spots the first digit has in it and in this case it's 1. 1, 2, 3, 5, and 7 have no enclosed spots when you type the number (though I'm sure some fonts would list an unenclosed 4 in this group); 4, 6, and 9 have one enclosed spot; and 8 has two enclosed spots.

The sequence would continue as such: 10, 20, 30, 41, 50, 61, 70, 82, 91, 101, 110, 120, 130, 141, 150, 161, 170, 182, 191, 201, etc.

The first number in the sequence to have a different last digit would be be 483.