Apocalyptetra numbers are numbers of the form 4n containing the digits 666 in their decimal expansions.[1]

The smallest apocalytetra number is \(4^{96}\) :

6,277,101,735,386,680,763,835,789,423,207,666,416,102,355,444,464,034,512,896

Because all powers of 4 are also powers of 2, apocalyptetra numbers are a subset of the apocalyptic numbers.

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See also

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