Untrigesimal is a number system where the base is 31 and the first 13 powers of 2 are palindromes. Full Repetend Prime Numbers: 7, 17, 29, 47, 53, 59, 61, 67, 71, 73, 89, 107, 131, 137, 197, 227, 229, 241, 269, 277, 283, 307, 311, 313, 337, 353, 359, 379, 389, 401, 419, 431, 433, 439, 443, 449
