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reviewed
approved
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reviewed
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Carole Dubois, <a href="/A333356/b333356.txt">Table of n, a(n) for n = 1..2322</a>
approved
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approved
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Terms describing the nonprimes nonprime digits' positions in a the way explained in the Comments section.
We don't read the 2 of 21 as this 2 is a prime digit. Thus are 32 and 75 are not in the sequence.
proposed
editing
editing
proposed
We don't read the 2 of 21 as this 2 is a prime digit. Thus are 32 and 75 not in the sequence. .