A077147 a(n) = floor({concatenation 123 ... up to n}/n).

1, 6, 41, 308, 2469, 20576, 176366, 1543209, 13717421, 1234567891, 112233444637, 10288065758426, 949667608470093, 88183420786508665, 8230452606740808761, 771604931881950821344, 72621640647713018479506, 6858710505617340634175651, 649772574216379639027166937, 61728394550556065707580859096

Offset

1,2

Links

Table of n, a(n) for n=1..20.

Formula

a(n) = floor(A007908(n) / n). - Sean A. Irvine, May 08 2025

Example

a(5) = floor(12345/5) = 2469.

Maple

seq(floor(parse(cat(seq(i, i=1..n)))/n), n=1..20); # C. Ronaldo, Feb 20 2005

Prog

(PARI) a(n) = my(s=""); for(k=1, n, s=Str(s, k)); eval(s)\n; \\ Michel Marcus, Mar 03 2026

Crossrefs

Cf. A007908.

Sequence in context: A127848 A113573 A083161 * A100770 A084397 A366837

Adjacent sequences: A077144 A077145 A077146 * A077148 A077149 A077150

Keyword

base,nonn

Author

Amarnath Murthy, Oct 30 2002

Extensions

More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Jan 17 2005

More terms from Michel Marcus, Mar 03 2026

Status

approved