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Search: id:A140764
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| A140764 |
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Numbers equal to the sum of the squares of their duodecimal digit factorials. |
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+0
1
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OFFSET
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1,2
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COMMENT
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In other words, numbers equal to the sum of the squares of factorials of their base-12 representation digits.
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REFERENCES
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J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 37, pp 15, Ellipses, Paris 2008.
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EXAMPLE
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We have, for instance, 37 = 31_(12) = (3!)^2 + (1!)^2 and 613 = 431_(12) = (4!)^2 + (3!)^2 + (1!)^2.
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CROSSREFS
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Cf. A014080.
Sequence in context: A133998 A056217 A105464 this_sequence A156923 A104180 A010953
Adjacent sequences: A140761 A140762 A140763 this_sequence A140765 A140766 A140767
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KEYWORD
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fini,full,nonn
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AUTHOR
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Lekraj Beedassy (blekraj(AT)yahoo.com), Jul 13 2008
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