More digits, terms and primes
I've just rediscovered (and recomputed by hand) the first terms of A281878 , which had been already submitted to the OEIS 7 years ago by Jean-Marc Falcoz and the author: NAME The sum of two successive terms is prime and the sum of two successive digits is also prime. DATA S = 0, 2, 1, 4, 3, 8, 5, 6, 7, 412, 9, 20, 21, 16, 111, 112, 121, 120, 29, 212, 11, 12, 125, 234, 149, 230, 203, 216, 143, 258, 305, 252, 167, 432, 161, 116, 123, 214, 165, 202, 129, 238, 303, 298, 321, 250, 207, 434, 323, 294, 307, 612, 325, 232, 141, 256, 505, 292, 147, 416, 503, 438, 349, 474, 347, 414, 329, 492, 385, 676, 525, 656, 507,... What about the analog sequence T, replacing "sum" by "absolute difference"? We would then have: NAME The absolute difference of two successive terms is prime and the absolute difference of two successive digits is also prime. DATA T = 0, 2, 4, 1, 3, 5, 7, 9, 6, 8, 13, 16, 14, 25, 20, 27, 24, 29, ... ______________ Same day update Jean-Marc Fal...