1801

This number is a prime.

Just showing those entries submitted by 'Post': (Click here to show all)

+ The larger of two successive cuban primes (1657, 1801) for which inserting any digit between adjacent digits never yields another prime. [Post]

+ The smallest multidigit prime which is the number of ways to write n^2 as the sum of n odd numbers, disregarding order. In this case, n = 7 is also a prime. [Post]

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