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A007921 Numbers that are not the difference of two primes. +0
9
7, 13, 19, 23, 25, 31, 33, 37, 43, 47, 49, 53, 55, 61, 63, 67, 73, 75, 79, 83, 85, 89, 91, 93, 97, 103, 109, 113, 115, 117, 119, 121, 123, 127, 131, 133, 139, 141, 143, 145, 151, 153, 157, 159, 163, 167, 169, 173, 175, 181, 183, 185, 187, 193 (list; graph; listen)
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.


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