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A192438
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Number of bases <= n in which n has no digits exceeding 9.
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0
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, 26, 26, 27, 27, 27, 28, 28, 28, 29, 28, 29, 30, 29, 29, 31, 30, 30, 31, 31, 31, 31, 31, 32, 33, 31, 31, 34, 33, 32, 33, 33
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..64.
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EXAMPLE
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30 is 1E, 1D, 1C, 1B, 1A in bases 16 through 20, while in other bases it uses only decimal digits. Thus a(30) = 30 - 5 = 25.
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PROG
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(PARI) a(n)=my(m, k); 1+sum(b=2, n, k=n; m=1; while(k, if(k%b>9, m=0; break); k\=b); m)
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CROSSREFS
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Sequence in context: A107602 A090322 A030066 * A081331 A080686 A036218
Adjacent sequences: A192435 A192436 A192437 * A192439 A192440 A192441
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KEYWORD
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nonn,base
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AUTHOR
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Vladimir Shevelev and Charles R Greathouse IV, Jul 01 2011
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STATUS
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approved
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