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Just showing those entries submitted by 'Noll': (Click here to show all) (17211)^4 + 1721^4 + (1721+1)^4 = 26317541869937 is prime.1721 and 1723 are twin primes. Given product of the first 32 primes x = 2*3*...*131, it is curious that x+1721 and x+1723 are also twin primes. 1721 and 1723 are twin primes. The sums of their digits 1+7+2+1 and 1+7+2+3 are also twin primes: 11, 13. Concatenating the prime previous to 1721 with itself, is prime: 17091721 is prime. [Noll]
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