%C A136296 "Special augmented numbers" from Zak Seidov

[zak seidov]

%C A136296 "Special augmented numbers"  p such that
the decimal number 1p1 is divisible by p:
1,11,13,77,91,137,9091,909091,90909091,9090909091,909090909091,90909090909091,9090909090909091,909090909090909091.
Notice the infinite pattern 
p=(90..90..90)91 with 1p1/p=21, e.g.,
1911/91=190911/9091=19090911/909091=21.

Prime numbers are
11, 13, 137, 9091, 909091, 909090909090909091


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