Voozh

A359124

Concatenate the decimal numbers 1,2,3,...,n, then add 1.

2, 13, 124, 1235, 12346, 123457, 1234568, 12345679, 123456790, 12345678911, 1234567891012, 123456789101113, 12345678910111214, 1234567891011121315, 123456789101112131416, 12345678910111213141517, 1234567891011121314151618, 123456789101112131415161719, 12345678910111213141516171820

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

a(n) = A007908(n)+1.

Studied in A069048.

LINKS

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

MATHEMATICA

Table[FromDigits[Flatten[IntegerDigits/@Range[n]]]+1, {n, 20}] (* Harvey P. Dale, Dec 20 2022 *)

PROG

(Python)