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Search: id:A117790
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| A117790 |
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Lucas numbers for which the sum of the digits is a prime. |
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+0
1
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| 1, 3, 7, 11, 29, 47, 76, 199, 322, 2207, 24476, 1149851, 141422324, 969323029, 2537720636, 10749957122, 73681302247, 119218851371, 312119004989, 505019158607, 2139295485799, 3461452808002, 5600748293801, 100501350283429
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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199 is in the sequence because (1) it is a Lucas number and (2) the sum of its digits 1+9+9=19 is a prime number.
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CROSSREFS
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Cf. A000204.
Sequence in context: A035095 A125878 A126112 this_sequence A014447 A125879 A131588
Adjacent sequences: A117787 A117788 A117789 this_sequence A117791 A117792 A117793
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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), Apr 15 2006
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EXTENSIONS
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a(6) corrected by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Apr 17 2006
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