A244559 Numbers obtained by concatenating the squares of the digits of n!.

1, 4, 36, 416, 140, 4940, 250160, 160940, 936464640, 9364646400, 981811366400, 1649810013600, 3644490406400, 6449149644811400, 1904936491693664000, 408144496481646464000, 925253664491646408136000, 36160494994902549464000, 141361625100160646494000

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Formula

a(n) = A048385(A000142(n)). - Michel Marcus, Jul 04 2014

Example

For n = 7, 7! = 5040 and a(7) = 250160, which is the concatenation of the squares of the digits of 5040. For n=8, 8! = 40320 and a(8) = 160940.

Prog

(Magma) [StringToInteger(&cat[IntegerToString(h): h in Reverse([i^2: i in Intseq(Factorial(n))])]): n in [1..50]];

Crossrefs

Cf. A000142, A048385.

Sequence in context: A002894 A202828 A131765 * A319175 A317147 A371679

Adjacent sequences: A244556 A244557 A244558 * A244560 A244561 A244562

Keyword

nonn,base

Author

Vincenzo Librandi, Jul 03 2014

Status

approved