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Search: id:A068692
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| A068692 |
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Largest n-digit prime with all even digits except for the least significant digit. |
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+0
3
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| 7, 89, 887, 8887, 88883, 888887, 8888861, 88888883, 888888887, 8888888809, 88888888801, 888888888887, 8888888888849, 88888888888889, 888888888888883, 8888888888888647, 88888888888888889, 888888888888888809
(list; graph; listen)
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OFFSET
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1,1
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MAPLE
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for n from 1 to 40 do a := prevprime((10^n-1)/9*8+2):b := convert(a, base, 10):c := true:for i from 2 to nops(b) do if((b[i] mod 2)>0) then c := false:end if:end do:while(c=false) do a := prevprime(a):b := convert(a, base, 10):c := true:for i from 2 to nops(b) do if((b[i] mod 2)>0) then c := false:end if:end do:end do:q[n] := a:end do:seq(q[k], k=1..40);
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CROSSREFS
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Cf. A068690, A068691.
Sequence in context: A142204 A071363 A089394 this_sequence A053302 A068877 A121044
Adjacent sequences: A068689 A068690 A068691 this_sequence A068693 A068694 A068695
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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 03 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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