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Search: id:A068684
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| A068684 |
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Primes obtained as a concatenation p,q,p where p and q are successive primes and p<q. |
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+0
1
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| 353, 131713, 171917, 192319, 293129, 374137, 434743, 596159, 677167, 139149139, 163167163, 179181179, 223227223, 229233229, 269271269, 281283281, 347349347, 379383379, 547557547, 683691683, 761769761, 857859857, 863877863
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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171917 is a prime which is the concatenation of 17, 19 and 17.
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PROGRAM
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(PARI) f(n)=prime(n)*(10^(ceil(log(prime(n+1))/log(10))+ceil(log(prime(n))/log(10))))+ prime(n+1)*10^ceil(log(prime(n))/log(10))+prime(n); for(n=1, 300, if(isprime(f(n))==1, print1(f(n), ", ")))
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CROSSREFS
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Cf. A068683, A078350.
Sequence in context: A101219 A134820 A126113 this_sequence A108375 A052479 A108875
Adjacent sequences: A068681 A068682 A068683 this_sequence A068685 A068686 A068687
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 02 2002
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EXTENSIONS
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More terms from Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 21 2002
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