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

Author

Vincenzo Librandi, Jul 03 2014

Keywords

• nonn
• base
• changed

Examples

			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.
		

Crossrefs

Cf. A000142, A048385.

Programs

Magma

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

Mathematica

Table[FromDigits[Flatten[IntegerDigits/@(IntegerDigits[n!]^2)]],{n,20}] (* Harvey P. Dale, Sep 07 2025 *)

Formula

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