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No-primes sequence (Posted on 2014-04-07) Difficulty: 2 of 5
Find the smallest 4-digit prime, consisting of odd digits only, such that by inserting another odd digit (new one or not) between each pair of its digits a composite 7-digit number is produced.

Bonus task 1: Find the smallest 7-digit prime (odd digits only), creating a 13-digit composite number .

Bonus task 2: List additional pairs (i.e. prime, digit) that display this feature.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
Solutioncomputer solutionCharlie2014-04-07 13:46:22
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