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A118504
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Sophie Germain primes for which the sum of the digits is also a Sophie Germain prime.
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0
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2, 3, 5, 11, 23, 29, 41, 83, 113, 131, 173, 191, 281, 443, 641, 911, 1013, 1019, 1031, 1103, 1451, 1499, 1811, 1901, 2003, 2063, 2351, 2399, 2939, 3299, 3389, 3413, 4793, 4919, 5051, 5279, 5303, 5501, 5639, 6113, 6131, 6269, 6449, 7079, 7103, 7121, 7211
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 191 is in the sequence because (1) it is a Sophie Germain prime and (2) the sum of its digits 1+9+1=11 is also a Sophie Germain prime.
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CROSSREFS
| Cf. A005384.
Sequence in context: A188534 A005384 A118571 * A038905 A019405 A079848
Adjacent sequences: A118501 A118502 A118503 * A118505 A118506 A118507
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KEYWORD
| base,nonn
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AUTHOR
| Luc Stevens (lms022(AT)yahoo.com), May 06 2006; corrected May 12 2006
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EXTENSIONS
| Corrected by T. D. Noe (noe(AT)sspectra.com), Oct 25 2006
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