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A104390
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2-Smith numbers.
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3
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32, 42, 60, 70, 104, 152, 231, 315, 316, 322, 330, 342, 361, 406, 430, 450, 540, 602, 610, 612, 632, 703, 722, 812, 1016, 1027, 1029, 1108, 1162, 1190, 1246, 1261, 1304, 1314, 1316, 1351, 1406, 1470, 1510, 1603, 2013, 2054, 2065, 2070, 2071, 2106, 2114
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listen;
history;
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internal format)
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OFFSET
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1,1
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REFERENCES
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McDaniel, W. L., "The Existence of infinitely Many k-Smith numbers", Fibonacci Quarterly, 25(1987), pp. 76-80.
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LINKS
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Table of n, a(n) for n=1..47.
S. S. Gupta, Smith Numbers.
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EXAMPLE
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32 is a 2-Smith number because sum of the digits of its prime factors, i.e. Sp (32) = Sp(2*2*2*2*2)= 2 + 2 + 2 + 2 + 2 = 10 which is equal to twice the digit sum of 32 i.e. 2*S(32) = 2*(3+2)=10
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CROSSREFS
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Cf. A006753, A104391.
Sequence in context: A167309 A159007 A114042 * A167528 A035112 A211813
Adjacent sequences: A104387 A104388 A104389 * A104391 A104392 A104393
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KEYWORD
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nonn,base
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AUTHOR
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Eric W. Weisstein, Mar 04, 2005 and Shyam Sunder Gupta (guptass(AT)rediffmail.com), Mar 11 2005
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STATUS
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approved
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