37

This number is a prime.

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The sum of the first four primes (2+3+5+7) plus the sum of the first four numbers of every possible prime made of at least two digits (1+3+7+9) equals 37. Note that the primes 3 and 7 are present in both groups. [Wiszowaty]

Submitted: 2026-02-01 05:54:59; Last Modified: 2026-02-01 07:04:53.