A093806 - OEIS

A093806

Primes n with property that sum of digits is prime and number of prime digits is prime.

23, 137, 157, 173, 223, 227, 229, 263, 283, 313, 317, 331, 337, 353, 359, 373, 379, 397, 557, 571, 577, 593, 733, 739, 751, 757, 773, 797, 823, 827, 937, 953, 977, 1033, 1123, 1213, 1217, 1231, 1237, 1259, 1277, 1279, 1297, 1303, 1307, 1321, 1327, 1367, 1433

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OFFSET

1,1

COMMENTS

a(2)=137, 137 is prime, sum of digits 11 is prime, number of prime digits {3,7} 2 is prime, a(6)=223, 223 is prime, sum of digits 7 is prime, number of prime digits {2,2,3} 3 is prime, a (15)=359, 359 is prime, sum of digits 17 is prime, number of prime digits {3,5} 2 is prime, ...

LINKS

Table of n, a(n) for n=1..49.

CROSSREFS

Cf. A093805, A094317, A094318.

Sequence in context: A009482 A191745 A260842 * A142679 A254758 A057883

Adjacent sequences: A093803 A093804 A093805 * A093807 A093808 A093809

KEYWORD

nonn,base

AUTHOR

Jani Melik, May 19 2004

STATUS

approved