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A118721
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Chen primes for which the sum of the digits is also a Chen prime.
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1
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2, 3, 5, 7, 11, 23, 29, 41, 47, 67, 83, 89, 101, 113, 131, 137, 139, 157, 179, 191, 197, 199, 227, 263, 269, 281, 311, 317, 337, 353, 359, 379, 401, 409, 443, 449, 461, 467, 487, 557, 571, 577, 599, 641, 647, 683, 719, 751, 797, 809, 821, 827, 829, 863, 881
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OFFSET
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1,1
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LINKS
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EXAMPLE
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29 is in the sequence because (1) it is a Chen prime and (2) the sum of its digits 2+9=11 is also a Chen prime.
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MATHEMATICA
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With[{ch=Select[Prime[Range[200]], PrimeOmega[#+2]<3&]}, Select[ch, MemberQ[ ch, Total[IntegerDigits[#]]]&]] (* Harvey P. Dale, May 10 2018 *)
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CROSSREFS
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KEYWORD
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base,nonn
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AUTHOR
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Luc Stevens (lms022(AT)yahoo.com), May 21 2006
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STATUS
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approved
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