the following nice puzzle:
Concatenated Digit Count as Prime
searching for numbers n whose concatenated
digit count (CDC) is a prime factor
We count the digits in the following order:
1s, 2s, 3s . . .9s, 0s.
Then we concatenate all the digits and
remove any leading zeros.
Here are the first three numbers with
6987076 = 2 *
2 * 79 * 22111
7070098 = 2 *
7 * 239 * 2113
8070089 = 1213 *
Q1. Can you extend this sequence?
Q2. What is the biggest CDC that you can
find of a number that belongs to the
(CDC must always be a prime number)