A359978 Prime numbers whose decimal representation can be split into two nonempty parts without leading 0, say x and y (in that order), and such that the concatenation of y and x yields a different prime number.
13, 17, 31, 37, 71, 73, 79, 97, 113, 127, 131, 149, 157, 163, 173, 181, 191, 197, 199, 271, 277, 311, 313, 317, 331, 337, 359, 367, 373, 379, 397, 419, 479, 491, 571, 577, 593, 617, 631, 673, 719, 727, 733, 739, 757, 761, 787, 797, 811, 839, 877, 911, 919, 937
Offset: 1
Examples
The first terms, alongside the corresponding other prime numbers, are:
n a(n) Other prime numbers
-- ---- -------------------
1 13 {31}
2 17 {71}
3 31 {13}
4 37 {73}
5 71 {17}
6 73 {37}
7 79 {97}
8 97 {79}
9 113 {131, 311}
10 127 {271}
11 131 {113, 311}
12 149 {491}
Links
- Rémy Sigrist, PARI program
Programs
-
PARI
See Links section.