WORMS  Play with Digit Seven
Description
A natural number x is called a good number if one or two of the next two conditions is satisfied:
 7 is a divisor of x.
 7 is a digit of x.
Task
Write a program that:
 reads a number n from the standard input,
 computes the number of good numbers in range[1,10^{n}],
 writes the result to the standard output.
Solve the problem by at most 0.5kB of source code.
Input
The input begins with an integer t(t<= 210), the number of test cases.t test cases follow.
For each test case, the first and only line contains an integer n (1<=n<=500).
Output
For each test case the output consists of one line that contains the answer.
Example
Sample input: 3 1 2 1 Sample output: 1 30 1
hide comments
urimaj:
20190131 22:30:20
Last edit: 20190131 22:30:51 

kilojewels:
20171111 14:55:46
i dont understand how 7 can be a divisor of 3 someone please help 

:D:
20110108 21:52:15
You completely ignored the first condition. What about 14,21,28,... ? 

Navin G V:
20110108 17:36:00
Thanks i thought both condition should be satisfied. Last edit: 20110109 08:01:51 
Added by:  Fudan University Problem Setters 
Date:  20070401 
Time limit:  1s 
Source limit:  512B 
Memory limit:  1536MB 
Cluster:  Cube (Intel G860) 
Languages:  All except: C99 ERL GOSU JSRHINO 
Resource:  Folklore, description, standard program and test data by Blue Mary 