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A068648
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Primes in which a string of 8's is sandwiched between two 1's.
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3
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11, 181, 188888881, 188888888888881, 18888888888888888888888888888888888888881, 188888888888888888888888888888888888888888888888888888888888888888888888888888888888888888881
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| 11 is also a member in which a string of 0 8's is there between two one's.
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MAPLE
| a := 1:b := 8:i := 1:for n from 0 to 500 do c := a+10*(10^n-1)/9*b+10^(n+1)*a; if(isprime(c)) then d[i] := c; i := i+1; end if; end do:q := seq(d[j], j=1..i-1);
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CROSSREFS
| Cf. A068645, A068646, A068647.
Sequence in context: A009118 A112943 A057618 * A034787 A001408 A185123
Adjacent sequences: A068645 A068646 A068647 * A068649 A068650 A068651
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 28 2002
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EXTENSIONS
| More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Mar 19 2002
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