# Cryptographic Mathematics

**Q: Programme Rowland’s formula and verify his results. Try different starting values and see what happens.**

In Sage math cloud, I did this:

```
i =7
n=2
for n in [1..10]:
i=i+gcd(n,i)
print i
```

Could you help, please?

i=7 n=2 for n in range(2,100): i=i+gcd(n,i) print i