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The nth Prime Page will now find any of the first 2.623˙10^{15} primes or
π(x) for x up to 10^{17}.
Just showing those entries submitted by 'Rivera': (Click here to show all) 55555544444441 is the smallest prime that produces a chain of 5 primes applying the following rule to each prime of the chain: Sum every digit powered to itself. E.g., 55555544444441 > 20543 > 3413 > 311 > 29. A chain of 6 provable primes will not be established for a long, long time. [Rivera]
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