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A002977 a(1) = 1; subsequent terms are defined by the rule that if m is present so are 2m+1 and 3m+1.
(Formerly M2335)
+0
12
1, 3, 4, 7, 9, 10, 13, 15, 19, 21, 22, 27, 28, 31, 39, 40, 43, 45, 46, 55, 57, 58, 63, 64, 67, 79, 81, 82, 85, 87, 91, 93, 94, 111, 115, 117, 118, 121, 127, 129, 130, 135, 136, 139, 159, 163, 165, 166, 171, 172, 175, 183, 187, 189, 190, 193, 202, 223, 231, 235, 237 (list; graph; listen)
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Last modified December 20 16:45 EST 2009. Contains 171081 sequences.


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