A046502 Primes with multiplicative persistence value 2.

29, 37, 43, 53, 67, 73, 83, 127, 137, 163, 167, 173, 199, 223, 233, 251, 257, 269, 271, 281, 317, 349, 431, 439, 457, 461, 521, 523, 541, 547, 563, 569, 587, 599, 613, 617, 631, 641, 653, 659, 761, 821, 827, 853, 857, 859, 919, 991, 1129, 1153, 1163, 1217

Offset: 1

Author

Patrick De Geest, Sep 15 1998

Keywords

• nonn
• base

Examples

			29 -> 2 * 9 -> [ 18 ] -> 1 * 8 -> [ 8 ] -> one digit in two steps.
		

Links

• Daniel Mondot, Table of n, a(n) for n = 1..10000
• Eric Weisstein's World of Mathematics, Multiplicative Persistence

Crossrefs

Intersection of A000040 and A046511.

Cf. A046500.