A362119 Concatenate the base-6 strings for 1,2,...,n.

1, 12, 123, 1234, 12345, 1234510, 123451011, 12345101112, 1234510111213, 123451011121314, 12345101112131415, 1234510111213141520, 123451011121314152021, 12345101112131415202122, 1234510111213141520212223, 123451011121314152021222324, 12345101112131415202122232425

Offset: 1

Author

Michael S. Branicky and N. J. A. Sloane, Apr 19 2023

Keywords

• nonn
• base

Comments

The smallest prime occurs at n = 12891. - Michael S. Branicky, Apr 20 2023

The b-file has only 313 terms, since a(314) has 1001 digits.

Links

• Michael S. Branicky, Table of n, a(n) for n = 1..313

Crossrefs

Cf. A362118, A058935, A360502, A117640, A362117, A007908.

Programs

Mathematica

A362119[n_]:=FromDigits[Flatten[IntegerDigits[Range[n],6]]];Array[A362119,20] (* Paolo Xausa, Nov 27 2023 *)

Python

from sympy.ntheory import digits
from itertools import count, islice
def agen(s="", base=6): yield from (int(s:=s+"".join(map(str, digits(n, base)[1:]))) for n in count(1))
print(list(islice(agen(), 20)))