A113017 Primes that become composites when their decimal representation is interpreted duodecimally.
13, 19, 23, 29, 41, 43, 47, 53, 59, 71, 73, 79, 83, 89, 97, 101, 103, 109, 113, 127, 137, 139, 149, 151, 163, 173, 179, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 257, 263, 269, 281, 283, 293, 311, 313, 317, 331, 337, 349, 353, 359, 367, 373, 379, 383
Offset: 1
Examples
A000040(25)=97 -> 9*12^1+7*12^0=108+7=115=5*23.
Links
- Robert Price, Table of n, a(n) for n = 1..26358
- Eric Weisstein's World of Mathematics, Duodecimal