A036603 a(n) = n! in binary.

1, 1, 10, 110, 11000, 1111000, 1011010000, 1001110110000, 1001110110000000, 1011000100110000000, 1101110101111100000000, 10011000010001010100000000, 11100100011001111110000000000, 101110011001010001100110000000000, 1010001001100001110110010100000000000

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn
• easy
• base

References

• Donald E. Knuth, Art of Computer Programming, Vol. 3, Sect. 5.3.1, Table 1.

Links

• Alois P. Heinz, Table of n, a(n) for n = 0..167
• Index entries for sequences related to factorial numbers.

Crossrefs

Cf. A000142, A049606.

Programs

Mathematica

FromDigits/@(IntegerDigits[#, 2]&/@(Range[0, 15]!)) (* Harvey P. Dale, Feb 05 2012 *)
BaseForm[Range[0, 15]!, 2] (* Alonso del Arte, May 19 2017 *)

PARI

a(n) = fromdigits(binary(n!), 10); \\ Michel Marcus, Jul 30 2025