12
This number is a composite.
Single Curio View: (Seek other curios for this number)
12 is the number of prime digits appearing in the first 12
primes and 21 is the number of prime digits appearing in
the first 21 primes. [Silva]
Submitted: 2011-12-31 11:59:59; Last Modified: 2020-01-24 01:44:12.
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