A046425 Numbers requiring 5 steps to reach a prime under the prime factor concatenation procedure.

14, 34, 147, 164, 183, 214, 216, 230, 236, 248, 252, 276, 285, 309, 324, 335, 404, 405, 444, 482, 484, 486, 508, 520, 527, 540, 550, 570, 580, 633, 636, 638, 658, 689, 704, 730, 738, 802, 814, 852, 915, 935, 954, 959, 960, 981, 996, 1004, 1037, 1046, 1058

Offset: 0

Author

Patrick De Geest, Jun 15 1998

Keywords

• nonn
• base

Examples

			14 = 2*7 -> 27 = 3*3*3 -> 333 = 3*3*37 -> 3337 = 47*71 -> 4771 = 13*367 and 13367 is prime.
		

Links

• Patrick De Geest, Home Primes

Crossrefs

Cf. A037271, A046411.