A189556 Prime numbers n such that x' = n has two solutions, where x' is the arithmetic derivative (A003415) of x.

31, 61, 71, 101, 103, 131, 199, 211, 241, 269, 359, 401, 421, 433, 439, 571, 619, 641, 661, 719, 727, 739, 751, 761, 811, 1019, 1051, 1063, 1193, 1277, 1279, 1303, 1307, 1321, 1451, 1471, 1499, 1613, 1619, 1667, 1697, 1721, 1723, 1783, 1879, 1949

Offset

1,1

Comments

The primes in A189555.

Links

Table of n, a(n) for n=1..46.

Crossrefs

Cf. A003415.

Sequence in context: A063339 A228541 A115833 * A185934 A052158 A095672

Adjacent sequences: A189553 A189554 A189555 * A189557 A189558 A189559

Keyword

nonn

Author

T. D. Noe, Apr 24 2011

Status

approved