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Search: id:A078237
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| A078237 |
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a(1) = 6, a(n+1) = smallest multiple of a(n) using only digits (4,6,8,9,0) and not divisible by 10. |
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+0
3
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| 6, 48, 96, 864, 6048, 489888, 460984608, 4880444044896, 6604089990008099904, 6406898466996448048966464, 488494490499084904898890846098449664
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Sequence is infinite - see Comments in A078233. - Fung Cheok Yin (cheokyin_restart(AT)yahoo.com.hk), Sep 02 2006
Terms after a(8) have at least 18 digits. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 01 2007
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MAPLE
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A078237 := proc(nmax) local a, k, anext, baddigs, overl; a := [6] ; baddigs := {1, 2, 3, 5, 7} ; while nops(a) <nmax do k := 2 ; while true do anext := k*op(-1, a) ; overl := baddigs intersect convert(convert(anext, base, 10), set) ; if ( anext mod 10 <> 0) and nops(overl) = 0 then a := [op(a), anext] ; print(a); break ; else k := k+1 ; fi ; od ; od ; RETURN(a) ; end: A078237(20) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 01 2007
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CROSSREFS
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Cf. A078236, A078238.
Sequence in context: A071878 A104256 A000252 this_sequence A052651 A153796 A167547
Adjacent sequences: A078234 A078235 A078236 this_sequence A078238 A078239 A078240
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KEYWORD
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base,more,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 23 2002
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EXTENSIONS
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a(7) from Jonathan Vos Post (jvospost3(AT)gmail.com), Mar 22 2006
a(8) from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 01 2007
More terms from Robert Gerbicz (robert.gerbicz(AT)gmail.com), May 09 2008
a(11) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 05 2008
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