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A085890
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Highly composite numbers (A002473) using digits in descending order. 1 is followed by a zero.
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1
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1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 21, 32, 54, 98, 210, 432
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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COMMENTS
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No more terms < 10^1000. Probably no more terms. - David Wasserman, Feb 10 2005
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LINKS
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Table of n, a(n) for n=1..16.
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EXAMPLE
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432 is a member as 432= 2^4*3^3.
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PROG
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(PARI) hcn(n) = while (!(n%2), n \=2); while (!(n%3), n \=3); while (!(n%5), n \=5); while (!(n%7), n \=7); n == 1; for (i = 0, 1000, for (j = 1, 9, n = sum(k = j - i, j, (k%10)*10^(i - j + k)); if (hcn(n), print(n)))); /* David Wasserman */
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CROSSREFS
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Cf. A002473, A085889.
Sequence in context: A247107 A061511 A138142 * A274842 A134817 A067581
Adjacent sequences: A085887 A085888 A085889 * A085891 A085892 A085893
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KEYWORD
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base,nonn
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AUTHOR
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Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 10 2003
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EXTENSIONS
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More terms from David Wasserman, Feb 10 2005
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STATUS
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approved
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