A171491 Natural numbers not divisible by their number of decimal digits.

11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 100, 101, 103, 104, 106, 107, 109, 110, 112, 113, 115, 116, 118, 119, 121, 122, 124, 125

Offset

1,1

Comments

Complement of A098952.

Asymptotic density 1. [Charles R Greathouse IV, Nov 13 2010]

Links

Michael S. Branicky, Table of n, a(n) for n = 1..10000

Example

100 has three digits and is not divisible by 3, therefore 100 is in the sequence.

Mathematica

Select[Range[150], !Divisible[#, IntegerLength[#]]&]  (* Harvey P. Dale, Apr 24 2011 *)

Prog

(Magma) [n: n in [1..140] | not IsIntegral(n/#Intseq(n))]; // Bruno Berselli, Feb 09 2016
(Python)
def ok(n): return n%len(str(n))
print([k for k in range(142) if ok(k)]) # Michael S. Branicky, Feb 07 2022

Crossrefs

Sequence in context: A358270 A358076 A292513 * A277268 A337254 A152200

Adjacent sequences: A171488 A171489 A171490 * A171492 A171493 A171494

Keyword

nonn,base

Author

Jaroslav Krizek, Dec 10 2009

Status

approved