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 A051018 Numbers that are 2-persistent but not 3-persistent. 10
 1023456789, 1023456879, 1023457689, 1023457869, 1023458679, 1023458769, 1023465789, 1023465879, 1023467589, 1023467859, 1023468579, 1023468759, 1023475689, 1023475869, 1023476589, 1023476859, 1023478569, 1023478659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A number n is k-persistent iff all of {n, 2n,..., kn} are pandigital (in the sense of A171102). LINKS Hans Havermann, Table of n, a(n) for n = 1..1000 Eric Weisstein's World of Mathematics, Persistent Number PROG (PARI) is_A051018(n, k=3)=10>#Set(Vec(Str(k*n))) & !while(k--, 9<#Set(Vec(Str(k*n)) | return)  \\ M. F. Hasler, Jan 10 2012 CROSSREFS Cf. A171102 (pandigital), A204047 (smallest n-persistent), A051264 (1-persistent), A051019 (3-persistent), A051020 (4-persistent), A204096 (5-persistent), A204097 (6-persistent). Sequence in context: A302096 A171102 A050278 * A020667 A154566 A217535 Adjacent sequences:  A051015 A051016 A051017 * A051019 A051020 A051021 KEYWORD nonn,base AUTHOR EXTENSIONS Definition corrected by Franklin T. Adams-Watters, Jan 09 2012 STATUS approved

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Last modified April 13 03:43 EDT 2021. Contains 342934 sequences. (Running on oeis4.)