Hello ladies and gentlemen!

It was a rather long time ago that Code Golf - The Reboot was active, and I enjoyed it so much, that I decided it would be fun to pick that up again. So here I am with a new task. Don't know what Code Golf is? Check some old topics. You have one week to complete this task, and entries should be submitted by sending a PM to me. Without any further ado, here is your task:

Write a program that inputs a positive integer and outputs the Belgium k-number of the input. Of course, you have no idea what a Belgium k-number is, so let me explain that first. Let k be one of the integers 0-9. The input N has the Belgium k-number, if N occurs in the increasing sequence which starts with k, and the difference between 2 consecutive numbers in the sequence are the same as the digits of N. See this for a better explanation. Let me give an example.

As you can see, 85 is in the sequence (7, 15, 20, 28, 33..), which means 85 as Belgium k-number 7.

Other example:

Providing that ANY input N>9 has at least 1 Belgium k-number, find one of the Belgium k-numbers with any input.

Good luck!

I've no idea if this is a simple or a hard task, we will see later!

It was a rather long time ago that Code Golf - The Reboot was active, and I enjoyed it so much, that I decided it would be fun to pick that up again. So here I am with a new task. Don't know what Code Golf is? Check some old topics. You have one week to complete this task, and entries should be submitted by sending a PM to me. Without any further ado, here is your task:

Write a program that inputs a positive integer and outputs the Belgium k-number of the input. Of course, you have no idea what a Belgium k-number is, so let me explain that first. Let k be one of the integers 0-9. The input N has the Belgium k-number, if N occurs in the increasing sequence which starts with k, and the difference between 2 consecutive numbers in the sequence are the same as the digits of N. See this for a better explanation. Let me give an example.

**Code:**```
k = 7, N = 85
```

Sequence starts with 7

7 + 8 = 15

15 + 5 = 20

20 + 8 = 28

28 + 5 = 33

33 + 8 = 41

41 + 5 = 46

46 + 8 = 54

54 + 5 = 59

59 + 8 = 67

67 + 5 = 72

72 + 8 = 80

80 + 5 = 85

STOP

As you can see, 85 is in the sequence (7, 15, 20, 28, 33..), which means 85 as Belgium k-number 7.

Other example:

**Code:**```
k = 7, N = 152
```

Sequence starts with 7

7 + 1 = 8

8 + 5 = 13

13 + 2 = 15

15 + 1 = 16

16 + 5 = 21

21 + 2 = 23

23 + 1 = 24

...

Providing that ANY input N>9 has at least 1 Belgium k-number, find one of the Belgium k-numbers with any input.

Good luck!

I've no idea if this is a simple or a hard task, we will see later!