A056967 Write what is described (putting a leading zero on numbers which have an odd number of digits).

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 11, 22, 33, 44, 55, 66, 77, 88, 99, 0, 111, 222, 333, 444, 555, 666, 777, 888, 999, 0, 1111, 2222, 3333, 4444, 5555, 6666, 7777, 8888, 9999, 0, 11111, 22222, 33333, 44444, 55555, 66666, 77777, 88888

Offset: 0

Author

Henry Bottomley, Jul 20 2000

Keywords

• base
• easy
• nonn

Examples

			a(123130415)=3335 since it should be read as 01.23.13.04.15, i.e., zero 1's followed by two 3's followed by one 3 followed by zero 4's followed by one 5.
		

Crossrefs

Cf. A005150, A010785, A047842, A056966.

Programs

Python

def A056967(n):
    s = str(n)
    s = '0'*(len(s)&1)+s
    return int('0'+''.join(s[i+1]*int(s[i])for i in range(0,len(s),2))) # Chai Wah Wu, Feb 12 2023