8 December 1998 - My birthday

Number Theory Level 3

Let b b and a a be last and second last digits respectively in decimal representation of: 8 12 1998 \Large 8^{{12}^{1998}}

Find ( 10 a + b ) − 19 (10a+b)-19


The answer is 77.

Mrigank Shekhar Pathak by Mrigank Shekhar Pathak , 22, India

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1 solution

Razing Thunder
Jul 3, 2020 
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s='8'
for i in range(1,1999):
    s=str(int(s)**12)[-2::]
a=int(s)-19
print(a)

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