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Search: id:A068659
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| A068659 |
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Primes among the concatenation of n, (n-1) and n. |
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+0
2
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| 131213, 171617, 313031, 333233, 434243, 474647, 494849, 636263, 777677, 898889, 939293, 117116117, 119118119, 127126127, 133132133, 151150151, 159158159, 161160161, 163162163, 199198199, 243242243, 269268269, 273272273, 277276277
(list; graph; listen)
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OFFSET
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0,1
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MAPLE
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for n from 1 to 1000 do a := n+10^( floor(log(n)/log(10)+0.000001 )+1)*(n-1); a := a+10^( floor(log(a)/log(10)+0.000001 )+1)*n; b[n] := a:end do:k := 0:for n from 2 to 1000 doif(isprime(b[n])) then k := k+1:c[k] := b[n]:end if:end do:seq(c[j], j=1..k);
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CROSSREFS
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Adjacent sequences: A068656 A068657 A068658 this_sequence A068660 A068661 A068662
Sequence in context: A017697 A013965 A036095 this_sequence A015407 A061732 A023046
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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 01 2002
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EXTENSIONS
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More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 26 2002
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