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 A062012 Decimal numbers k such that there is some base b such that (k regarded as a base-b number) = (1/b)*(k regarded as a base-10 number). 0
 21, 1066338805156287287067, 1124161332414632881704, 2305867155177711644802, 2306166776784312535170, 5744341611556736174883 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..6. EXAMPLE 21_3 = 7 = 21/3, so 21 is a term. 30 is not a term because the base b would be 5 with 30_5 = 15, but 30 is not 5*15. PROG (PARI) isok(n) = {my (d = digits(n)); for (b=vecmax(d)+1, max(9, vecmax(d)-1), if (n == b*fromdigits(d, b), return (1)); ); return (0); } \\ Michel Marcus, Dec 11 2017 CROSSREFS Subsequence of A062010. Sequence in context: A013898 A180727 A250487 * A104786 A104787 A023922 Adjacent sequences: A062009 A062010 A062011 * A062013 A062014 A062015 KEYWORD base,fini,full,nice,nonn AUTHOR Erich Friedman, Jun 27 2001 EXTENSIONS Name corrected by Michel Marcus, Dec 11 2017 STATUS approved

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Last modified February 21 06:10 EST 2024. Contains 370219 sequences. (Running on oeis4.)