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Search: id:A162250
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| A162250 |
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Values of the form prime(prime(i)) with a digits sum which is prime. |
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+0
1
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| 3, 5, 11, 41, 67, 83, 157, 179, 191, 241, 283, 331, 353, 401, 461, 599, 739, 773, 797, 919, 991, 1031, 1217, 1297, 1433, 1471, 1499, 1523, 1723, 1741, 1787, 2027, 2063, 2081, 2221, 2269, 2351, 2609, 2647, 2683, 2719, 2803, 3019, 3109, 3169, 3259, 3299
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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{A006450(i) : A007953(A006450(i)) in A000040}. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 03 2009]
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EXAMPLE
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Prime(prime(6)) = 41. 4+1=5, prime. So 41 is in the sequence.
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PROGRAM
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(PARI) sodip(n) = {
local(s=0, a, x, y, j, p);
for(x=1, n, p=prime(prime(x)); a=eval(Vec(Str(p))); y=sum(j=1, length(a), a[j]); if(isprime(y), print1(p", ")); )
}
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CROSSREFS
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Sequence in context: A082856 A060881 A035345 this_sequence A055511 A105236 A144467
Adjacent sequences: A162247 A162248 A162249 this_sequence A162251 A162252 A162253
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KEYWORD
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nonn
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AUTHOR
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Cino Hilliard (hillcino368(AT)hotmail.com), Jun 28 2009
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EXTENSIONS
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Definition rephrased by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 11 2009
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