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A007620 Practical numbers (second definition): numbers n such that every k <= n is a sum of proper divisors of n (for n>1).
(Formerly M4095)
+0
4
1, 6, 12, 18, 20, 24, 28, 30, 36, 40, 42, 48, 54, 56, 60, 66, 72, 78, 80, 84, 88, 90, 96, 100, 104, 108, 112, 120, 126, 132, 140, 144, 150, 156, 160, 162, 168, 176, 180, 192, 196, 198, 200, 204, 208, 210, 216, 220, 224, 228, 234, 240, 252, 260, 264, 270, 272, 276, 280, 288, 294, 300, 304, 306 (list; graph; listen)
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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.


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