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A068703
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Primes in the concatenation n,n+1, n+2, n+1, n.
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34543, 1718191817, 2324252423, 3334353433, 3940414039, 7778797877, 8788898887, 123124125124123, 153154155154153, 159160161160159, 173174175174173, 207208209208207, 227228229228227, 279280281280279
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 1718191817 is a term as the concatenation of 17,18,19,18 and 17.
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MAPLE
| for n from 1 to 1500 do a := n+10^( floor(evalf(log(n)/log(10))+0.0000000001 )+1)*(n+1); a := a+10^( floor(evalf(log(a)/log(10))+0.0000000001 )+1)*(n+2); a := a+10^( floor(evalf(log(a)/log(10))+0.0000000001 )+1)*(n+1); a := a+10^( floor(evalf(log(a)/log(10))+0.0000000001 )+1)*n; b[n] := a:end do:k := 0:for n from 2 to 1500 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
| Sequence in context: A204411 A055001 A164556 * A081428 A023336 A172579
Adjacent sequences: A068700 A068701 A068702 * A068704 A068705 A068706
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 04 2002
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EXTENSIONS
| More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 27 2002
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