16006...79263 (15016-digits)

This number is a prime.

88233*2^49863-1 is prime. Note that 1^10 + 2^9 + 3^8 + 4^7 + 5^6 + 6^5 + 7^4 + 8^3 + 9^2 + 10^1 = 49863, and that 8*8+2*3+3 is prime. [Earls]