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Search: id:A073186
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| A073186 |
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First n-digit prime in "the sequence of even integers": 246810121416182022242628303234... |
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+0
2
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| 2, 41, 101, 8101, 30323, 141161, 2468101, 42628303, 246810121, 8101214161, 68101214161, 890929496981, 1081101121141, 68890929496981, 202224262830323, 6416616817017217, 58606264666870727, 618202224262830323
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Leading zeros are forbidden (cf. A073468).
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EXAMPLE
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a(6)=141161 because first 6-digit prime in "the sequence of even integers": 246810121416182022242628303234... is 141161 (omiiting initial zeros, otherwise 6 successive integers which give first "6-digital" prime are "001021" )
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MATHEMATICA
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p200=Flatten[IntegerDigits[2*Range[200]]]; Do[pn=Partition[p200, n, 1]; ln=Length[pn]; tab=Table[Sum[10^(n-k)*pn[[i, k]], {k, n}], {i, ln}]; tas=Select[tab, PrimeQ]; Print[{n, tas[[1]], tas[[2]], tas[[3]]}], {n, 20}]
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CROSSREFS
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Sequence in context: A041199 A100514 A073468 this_sequence A103335 A047936 A007533
Adjacent sequences: A073183 A073184 A073185 this_sequence A073187 A073188 A073189
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KEYWORD
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nonn,base
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Aug 22 2002
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EXTENSIONS
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Corrected and extended by Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Feb 02 2003
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