A110414 n! concatenated with n divided by n.

11, 11, 21, 61, 241, 1201, 7201, 50401, 403201, 36288001, 362880001, 3991680001, 47900160001, 622702080001, 8717829120001, 130767436800001, 2092278988800001, 35568742809600001, 640237370572800001

Offset

1,1

Links

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

Formula

(n-1)! followed by a 1.

Example

a(14) = 622702080001: 14! concatenated with 14 is 8717829120014 and 87178291200/14 = 622702080001.

Maple

c:=proc(x, y) local s: s:=proc(m) nops(convert(m, base, 10)) end: x*10^s(y)+y: end: a:=n->c(n!, n)/n: seq(a(n), n=1..22); # c yields the concatenation of two positive integers # Emeric Deutsch, Aug 07 2005

Mathematica

Table[(n!*10^IntegerLength[n]+n)/n, {n, 20}] (* Harvey P. Dale, Sep 10 2016 *)

Prog

(PARI) a(n) = fromdigits(concat(digits(n!), digits(n)))/n; \\ Michel Marcus, Aug 18 2019

Crossrefs

Cf. A110415.

Sequence in context: A167130 A299781 A168459 * A040111 A003887 A138844

Adjacent sequences: A110411 A110412 A110413 * A110415 A110416 A110417

Keyword

base,easy,nonn

Author

Amarnath Murthy, Aug 01 2005

Extensions

More terms from Emeric Deutsch and Erich Friedman, Aug 07 2005

Status

approved