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A140222 A number n is included if (sum{k=1 to n} d(k)) is prime, where d(k) is the number of divisors of k. +0
2
2, 3, 9, 11, 13, 14, 28, 29, 31, 34, 35, 51, 54, 56, 61, 81, 83, 93, 94, 97, 98, 123, 124, 131, 140, 142, 171, 173, 177, 179, 180, 185, 187, 190, 191, 193, 195, 228, 230, 231, 233, 234, 248, 251, 290, 293, 294, 296, 297, 304, 309, 310, 315, 316, 320, 322, 373 (list; graph; listen)
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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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