133

This number is a composite.

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The smallest composite number formed from a prime (in this case 31) written in base-4 and read as base-10. The sequence begins 133, 221, 323, 1003, 1121, 1211, … . [Honaker]

Submitted: 2022-11-06 17:24:00; Last Modified: 2022-11-06 17:38:14.