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A103126
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5-Smith numbers.
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1
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2030, 10203, 12110, 20210, 20310, 21004, 21010, 24000, 24010, 31010, 41001, 50010, 70000, 100004, 100012, 100210, 100310, 100320, 101020, 101041, 102022, 103200, 104010, 104101, 104110, 105020, 106001, 110020, 110202, 110212, 110400, 111013
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history;
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..32.
S. S. Gupta, Smith Numbers.
W. L. McDaniel, The Existence of infinitely Many k-Smith numbers, Fibonacci Quarterly, 25(1987), pp. 76-80.
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EXAMPLE
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2030 is a 5- Smith number because the sum of the digits of its prime factors, i.e., Sp(2030) = Sp(2*5*7*29) = 2 + 5 + 7 + 2 + 9 = 25, which is equal to 5 times the digit sum of 2030, i.e., 5*S(2030) = 5*(2 + 0 + 3 + 0) = 25.
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CROSSREFS
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Cf. A006753.
Sequence in context: A031543 A031723 A145721 * A045869 A098808 A212477
Adjacent sequences: A103123 A103124 A103125 * A103127 A103128 A103129
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KEYWORD
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base,nonn
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AUTHOR
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Shyam Sunder Gupta, Mar 16 2005
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STATUS
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approved
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