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A109981
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Primes such that both the sum of digits and the number of digits are primes.
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2
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11, 23, 29, 41, 43, 47, 61, 67, 83, 89, 101, 113, 131, 137, 139, 151, 157, 173, 179, 191, 193, 197, 199, 223, 227, 229, 241, 263, 269, 281, 283, 311, 313, 317, 331, 337, 353, 359, 373, 379, 397, 401, 409, 421, 443, 449, 461, 463, 467, 487, 557, 571, 577, 593
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Cf. A046704 Additive primes: sum of digits is a prime, A088136 Primes such that sum of first and last digits is prime.
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EXAMPLE
| a(86) = 10037 because both the sum (=11) and number (=5) of digits are primes.
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MATHEMATICA
| Select[Prime[Range[200]], PrimeQ[Length[IntegerDigits[ # ]]]&&PrimeQ[Plus@@IntegerDigits[ # ]]&]
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CROSSREFS
| Cf. A046704, A088136.
Sequence in context: A138537 A136000 A054723 * A091367 A088136 A164932
Adjacent sequences: A109978 A109979 A109980 * A109982 A109983 A109984
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KEYWORD
| base,nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Jul 06 2005
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