The first few centered heptagonal primes are:43, 71, 197, 463, 547, 953, 1471, 1933, 2647, 2843, 3697, ...and centered heptagonal twin prime numbers are:43, 71, 197, 463, 1933, 5741, 8233, 9283, 11173, 14561, 34651, ... .