53

This number is a prime.

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

+ This number is an emirp in 11 straight bases, from base 30 through base 40. Does any other number have such a string of bases attached to it? [Merickel]

+ Doubling 53 places a 0 between the digits of its index, i.e., 2*(5+3). [Merickel]

(There is one curio for this number that has not yet been approved by an editor.)

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