2717

This number is a composite.

The next year in the following form: (product of next n primes)/(sum of first n primes), i.e., (2+3+5+7) divides (11*13*17*19). Is it the last? [Honaker]

The only 2-sphenic number (2717 = 11 x 13 x 19) concatenated from two double-digit numbers (c;n) showing that c is the nth composite number, i.e., 27 is the 17th composite number. [Loungrides]