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Search: id:A130122
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| A130122 |
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Primes prime(n) such that 10*prime(n)+prime(n+2) is prime. |
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+0
1
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| 3, 5, 7, 11, 13, 17, 41, 67, 89, 101, 109, 181, 193, 199, 223, 227, 283, 313, 337, 347, 367, 419, 421, 449, 461, 479, 491, 587, 641, 647, 709, 727, 773, 811, 823, 827, 857, 859, 863, 881, 887, 911, 953, 1021, 1049, 1063, 1091, 1181, 1217, 1361, 1399, 1447
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(7)=41 because 10*41+47=457 and 457 is prime,
a(8)=67 because 10*67+73=743 and 743 is prime,
a(9)=89 because 10*89+101=991 and 991 is prime, ...
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MAPLE
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ts_p6_01:=proc(n) local a, b, i, ans; ans := [ ]: for i from 1 to n do a := 10*ithprime(i)+ithprime(i+2): if (isprime(a)=true) then ans := [ op(ans), ithprime(i) ]: fi od; RETURN(ans) end: ts_p6_01(1000);
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CROSSREFS
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Cf. A129900.
Sequence in context: A136186 A023210 A136187 this_sequence A046494 A026603 A126991
Adjacent sequences: A130119 A130120 A130121 this_sequence A130123 A130124 A130125
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KEYWORD
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nonn
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AUTHOR
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Jani Melik (jani_melik(AT)hotmail.com), Aug 01 2007
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