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Is this a good way to solve this problem?
By fker, history, 6 months ago, In English

327B - Hungry Sequence

just guess that I can generate a wierd array with the bad numbers like 171.

so I construct this formula: x = (i+17)*71+177171 then it is accepted..

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6 months ago, hide # |
 
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I prefer learning Sieve of Erathostenes for this question.

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6 months ago, hide # |
 
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You can refer to this — the Sieve of Eratosthenes is a very efficient way to handle such problems.

Sieve of Eratosthenes

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