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A140764 Numbers equal to the sum of the squares of their duodecimal digit factorials. 0
1, 37, 613, 519018 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

In other words, numbers equal to the sum of the squares of factorials of their base-12 representation digits.

REFERENCES

J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 37, pp 15, Ellipses, Paris 2008.

LINKS

Table of n, a(n) for n=1..4.

EXAMPLE

We have, for instance, 37 = 31_(12) = (3!)^2 + (1!)^2 and 613 = 431_(12) = (4!)^2 + (3!)^2 + (1!)^2.

CROSSREFS

Cf. A014080.

Sequence in context: A231381 A056217 A105464 * A228225 A156923 A104180

Adjacent sequences:  A140761 A140762 A140763 * A140765 A140766 A140767

KEYWORD

fini,full,nonn,base

AUTHOR

Lekraj Beedassy, Jul 13 2008

STATUS

approved

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Last modified February 16 08:26 EST 2019. Contains 320159 sequences. (Running on oeis4.)