Hemiperfect數
最小的k-hemiperfect數
下表列出在k ≤ 17範圍內.各k值下k-hemiperfect數的最小值(OEIS中的数列A088912)。
k | 最小的k-hemiperfect數 |
---|---|
3 | 2(也是唯一的3-hemiperfect數) |
5 | 24 |
7 | 4320 |
9 | 8910720 |
11 | 17116004505600 |
13 | 170974031122008628879954060917200710847692800 |
15 | 12749472205565550032020636281352368036406720997031277595140988449695952806020854579200000[1] |
17 | 27172904004644864174776390325441204588387876949911859015099963347683477337589882757168182488651338324482275518065870009252589097916253652597707421065171952334010184222064839170719744000000000[1] |
例如24的除數函數為24的5/2倍.因此24為5-hemiperfect數:
- 1 + 2 + 3 + 4 + 6 + 8 + 12 + 24 = 60 = 5/2 × 24.
參考資料
- . Numericana.com. [2012-08-21]. (原始内容存档于2017-05-17).
外部連結
整數數列線上大全(OEIS)中有包括以下k較小的k-hemiperfect數
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