A094873 n! has a triangular number of digits.

0, 1, 2, 3, 5, 6, 9, 13, 17, 32, 38, 44, 65, 106, 125, 135, 156, 178, 201, 213, 278, 292, 306, 335, 350, 381, 413, 446, 463, 480, 570, 589, 608, 647, 667, 687, 728, 749, 770, 880, 996, 1020, 1044, 1169, 1247, 1300, 1327, 1354, 1437, 1551, 1669, 1699, 1760

Offset

0,3

Links

Table of n, a(n) for n=0..52.

Formula

{n: A034886(n) in A000217}. - R. J. Mathar, Nov 15 2019

Mathematica

Select[Range[0, 1800], OddQ[Sqrt[1+8 IntegerLength[#!]]]&] (* Harvey P. Dale, Aug 07 2023 *)

Crossrefs

Cf. A000217, A006488.

Sequence in context: A330228 A166048 A240306 * A240726 A240203 A018126

Adjacent sequences: A094870 A094871 A094872 * A094874 A094875 A094876

Keyword

base,nonn

Author

Jason Earls, Jun 16 2004

Status

approved