A140764 Numbers equal to the sum of the squares of their duodecimal digit factorials.

1, 37, 613, 519018

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 * A348301 A228225 A156923

Adjacent sequences: A140761 A140762 A140763 * A140765 A140766 A140767

Keyword

fini,full,nonn,base

Author

Lekraj Beedassy, Jul 13 2008

Status

approved