Primes that remain prime when their leading digit in binary representation is replaced by 0.
7, 11, 13, 19, 23, 29, 37, 43, 61, 67, 71, 83, 101, 107, 131, 139, 151, 157, 181, 199
1 seqfan posts
Fri Apr 8 15:42:35 CEST 2011 [seqfan] Concerning A078686 & A091932.