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A079042
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Numbers n in which the first k digits of n form an integer divisible by k^2, for k = 1, 2, ..., m, where m is the number of digits in n.
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4
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1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 126, 162, 207, 243, 288, 324, 360, 369, 405, 441, 486, 522, 567, 603, 648, 684, 720, 729, 765, 801, 846, 882, 927, 963, 1264, 2432, 2880, 3248, 3600, 3696
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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EXAMPLE
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a(86) = 6480005 because 6 is divisible by 1^2, 64 by 2^2, 648 by 3^2, 6480 by 4^2, 64800 by 5^2, 648000 by 6^2, 6480005 by 7^2.
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CROSSREFS
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KEYWORD
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easy,fini,full,nonn,base
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AUTHOR
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Sudipta Das (juitech(AT)vsnl.net), Feb 01 2003
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STATUS
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approved
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