[seqfan] Insert "+" and always get a prime

[Eric Angelini]

Hello SeqFans,
Look at those integers:

110,112,116,118,130,136

You will always get a prime if you insert 
a "+" sign inside them, no matter where:

110 --> 1+10=11 and 11+0=11
112 --> 1+12=13 and 11+2=13
116 --> 17
118 --> 19
130 --> 1+30=31 and 13+0=13
136 --> 1+36=37 and 13+6=19

101 is not an integer with this property
as 1+01=2 is not allowed (no substring 
starting with "0").

I guess S, the sequence of integers that
share this property) will start like this:

S = 11, 12, 14, 16, 20, 21, 23, 25, 29, 30, 32, 34, 38, 41, 43, 47, 49, 50, 52, 56, 58, 61, 65, 67, 70, 74, 76, 83, 85, 89, 92, 94, 98, 110, 112, 116, 118, 130, 136,...
Best,
É.