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A189556
Prime numbers n such that x' = n has two solutions, where x' is the arithmetic derivative (A003415) of x.
1
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.
CROSSREFS
Cf. A003415.
Sequence in context: A063339 A228541 A115833 * A185934 A052158 A095672
KEYWORD
nonn
AUTHOR
T. D. Noe, Apr 24 2011
STATUS
approved