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[项目新闻] 【数学类】【项目介绍施工中】Amicable Numbers

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发表于 2018-3-28 23:40:03 | 显示全部楼层 |阅读模式

项目名称:Amicable Numbers
项目网址:https://sech.me/boinc/Amicable/
项目介绍:
Amicable Numbers is an independent research project that uses Internet-connected computers to find new amicable pairs. You can contribute to our research by running a free program on your computer.

Current goal of the project is to find all amicable pairs with smallest member < 1020.
All new findings are published regularly on the Amicable pairs list page.

有关科普(wiki):
相亲数(Amicable Pair),又称亲和数友爱数友好数,指两个正整数中,彼此的全部约数之和(本身除外)与另一方相等。毕达哥拉斯曾说:“朋友是你灵魂的倩影,要像220与284一样亲密。”
每一对亲和数都是过剩数亏数,较小的是过剩数,较大的是亏数
例如220与284:
  • 220的全部因数(除掉本身)相加是:1+2+4+5+10+11+20+22+44+55+110=284
  • 284的全部因数(除掉本身)相加的和是:1+2+4+71+142=220
亲和数中可轻易推出,一方的全部约数之和与另一方的全部约数之和相等。(此叙述不可逆,不能用来判断是否为亲和数)
  • 220的全部约数之和是:1+2+4+5+10+11+20+22+44+55+110+220 = 284+220 = 504
  • 284的全部约数之和是:1+2+4+71+142+284 = 220+284 = 504
前十个相亲数是:(220,284),(1184,1210),(2620,2924),(5020,5564),(6232,6368),(10744,10856),(12285,14595), 17296,18416),(63020,76084)和(66928,66992)

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 楼主| 发表于 2018-3-28 23:45:54 | 显示全部楼层
2018-03-27: Amicable Numbers, GPU version fix

There was a serious bug in GPU version: https://github.com/SChernykh/Ami ... b7ab4c912d2b9365a93
Unfortunately, it skipped some numbers in an unpredictable way for "large primes" work units for the last 20 days 9 days. I'll have to reissue all such work units to cover everything missed. The GPU versions for all platforms are already updated.

Sorry for the mess, but it's good that the bug is fixed relatively early, because it was hard to notice.






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2018-03-27: Amicable Numbers, GPU计算程序问题修复
之前在GPU计算程序中出现了一个严重的bug:https://github.com/SChernykh/Amicable/commit/3470ed855d244100f37b0b7ab4c912d2b9365a93
非常不幸地,这个漏洞导致计算程序略过了许多本应验证的数字。我不得不重新发放收到影响的任务包,确保没有错过任何数。目前所有平台的GPU计算程序都已修复并更新。
我们对此次重大失误表示抱歉,不过万幸的是这个bug被及时地发现了,因为它真的非常隐蔽。


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发表于 2018-8-5 13:48:50 | 显示全部楼层
Power outage
The server was down today between 11:04 and 14:20 (CEST) because of a major power outage in Hetzner datacenter. Everything should be up and running again now.
24 May 2018, 12:41:34 UTC · 讨论




停电
2018-05-24

由于 Hetzner 数据中心的一次大停电,今天(2018-05-24)服务器在 11:04 到 14:20 (CEST=UTC+1)之间宕机。
现在一切都应该恢复正常了。

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