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A061104
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Smallest number whose digit sum is n^2.
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4
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0, 1, 4, 9, 79, 799, 9999, 499999, 19999999, 999999999, 199999999999, 49999999999999, 9999999999999999, 7999999999999999999, 7999999999999999999999, 9999999999999999999999999
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n = 0..94
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FORMULA
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a(n) = ((n^2 mod 9) + 1)*10^floor(n^2/9) - 1. - Henry Bottomley, Apr 24 2001
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EXAMPLE
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a(5) = 799, 7 + 9 + 9 = 25 = 5^2.
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PROG
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(PARI) { for (n=0, 94, a=(n^2%9 + 1)*10^(n^2\9) - 1; write("b061104.txt", n, " ", a) ) } \\ Harry J. Smith, Jul 18 2009
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CROSSREFS
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Cf. A051885, A061105.
Sequence in context: A327579 A041597 A041030 * A082381 A155931 A309801
Adjacent sequences: A061101 A061102 A061103 * A061105 A061106 A061107
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy, Apr 20 2001
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STATUS
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approved
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