T*n
2 楼
staples的deal,第一台HP$250,Acer$300。HP应该更好些,但是担心n3530会不会太慢
。另外touchscreen实际使用上有多大好处?多谢了
1) HP 15-r063nr [staples.com] - In ad for $349 (originally $499). Should be
$249 after coupon
Intel® Pentium® N3530 Processor
4GB DDR3L SDRAM, 500GB 5400RPM hard drive
15.6-inch diagonal HD BrightView WLED-backlit touchscreen display (
1366x768)
1 x USB 3.0 port and 2 x USB 2.0 ports
1x1 802.11b/g/n WLAN
Windows 8.1
2)Toshiba C55-B5272 [staples.com] In ad for $399 AR ($549 originally).
Should be $299 AR and coupon.
Intel® Core™ i3-3217U Processor
6GB DDR3L memory, 750G hard drive
15.6” diagonal, TruBrite® display.
1 USB 3.0 port and 2 USB 2.0 ports: For fast digital video, audio and
data transfer.
Built-in high-speed wireless LAN (802.11b/g/n)
Windows 7 Home Premium
。另外touchscreen实际使用上有多大好处?多谢了
1) HP 15-r063nr [staples.com] - In ad for $349 (originally $499). Should be
$249 after coupon
Intel® Pentium® N3530 Processor
4GB DDR3L SDRAM, 500GB 5400RPM hard drive
15.6-inch diagonal HD BrightView WLED-backlit touchscreen display (
1366x768)
1 x USB 3.0 port and 2 x USB 2.0 ports
1x1 802.11b/g/n WLAN
Windows 8.1
2)Toshiba C55-B5272 [staples.com] In ad for $399 AR ($549 originally).
Should be $299 AR and coupon.
Intel® Core™ i3-3217U Processor
6GB DDR3L memory, 750G hard drive
15.6” diagonal, TruBrite® display.
1 USB 3.0 port and 2 USB 2.0 ports: For fast digital video, audio and
data transfer.
Built-in high-speed wireless LAN (802.11b/g/n)
Windows 7 Home Premium
a*x
3 楼
我本科时一直想到的,自己没做出来。那个会证pi是无理数的帮个忙。
2^(2^(2^(...(2^n)))...)+1这种形式的自然数,指数共i层,n是自然数。是否存在i
,使
得所有的这种形式的数都是质数
2^(2^(2^(...(2^n)))...)+1这种形式的自然数,指数共i层,n是自然数。是否存在i
,使
得所有的这种形式的数都是质数
i*t
5 楼
你家小朋友多大?
be
【在 T****n 的大作中提到】
: staples的deal,第一台HP$250,Acer$300。HP应该更好些,但是担心n3530会不会太慢
: 。另外touchscreen实际使用上有多大好处?多谢了
: 1) HP 15-r063nr [staples.com] - In ad for $349 (originally $499). Should be
: $249 after coupon
: Intel® Pentium® N3530 Processor
: 4GB DDR3L SDRAM, 500GB 5400RPM hard drive
: 15.6-inch diagonal HD BrightView WLED-backlit touchscreen display (
: 1366x768)
: 1 x USB 3.0 port and 2 x USB 2.0 ports
: 1x1 802.11b/g/n WLAN
be
【在 T****n 的大作中提到】
: staples的deal,第一台HP$250,Acer$300。HP应该更好些,但是担心n3530会不会太慢
: 。另外touchscreen实际使用上有多大好处?多谢了
: 1) HP 15-r063nr [staples.com] - In ad for $349 (originally $499). Should be
: $249 after coupon
: Intel® Pentium® N3530 Processor
: 4GB DDR3L SDRAM, 500GB 5400RPM hard drive
: 15.6-inch diagonal HD BrightView WLED-backlit touchscreen display (
: 1366x768)
: 1 x USB 3.0 port and 2 x USB 2.0 ports
: 1x1 802.11b/g/n WLAN
d*n
10 楼
做inspection是对自己负责呀,谁也不能保证新房就没有问题呀。
H*i
12 楼
这不就是增长飞快的费马数么。。
a*x
13 楼
费马数只有两层,而且被证明了不一定是素数。我是想知道多到几层时会都成为素数。
以前编程算过,很快溢出了
以前编程算过,很快溢出了
H*i
14 楼
编程肯定不行啊 你2^2^2^2就是F16 现在验证过的只到F12 13左右
不过有生之年F16或许还能看到验证。。
不过有生之年F16或许还能看到验证。。
S*I
15 楼
根据wiki:
As of 2010 it is known that Fn is composite for 5 ≤ n ≤ 32, although
complete factorizations of Fn are known only for 0 ≤ n ≤ 11, and there are
no known factors for n = 20 and n = 24. The largest Fermat number known to
be composite is F2747497, and its prime factor 57×2^2747499 + 1 was
discovered by Marshall Bishop in PrimeGrid's Proth Prime Search on May 13,
2013.
【在 H*******i 的大作中提到】
: 编程肯定不行啊 你2^2^2^2就是F16 现在验证过的只到F12 13左右
: 不过有生之年F16或许还能看到验证。。
As of 2010 it is known that Fn is composite for 5 ≤ n ≤ 32, although
complete factorizations of Fn are known only for 0 ≤ n ≤ 11, and there are
no known factors for n = 20 and n = 24. The largest Fermat number known to
be composite is F2747497, and its prime factor 57×2^2747499 + 1 was
discovered by Marshall Bishop in PrimeGrid's Proth Prime Search on May 13,
2013.
【在 H*******i 的大作中提到】
: 编程肯定不行啊 你2^2^2^2就是F16 现在验证过的只到F12 13左右
: 不过有生之年F16或许还能看到验证。。
S*I
16 楼
根据wiki:
There are no other known Fermat primes Fn with n > 4. However, little is
known about Fermat numbers with large n. In fact, each of the following is
an open problem:
Is Fn composite for all n > 4?
Are there infinitely many Fermat primes?
Are there infinitely many composite Fermat numbers?
你的这个数是Fermat number的一个特例,如果上述问题解决了,你的问题也就解决了
。当然,这可不是个简单的数学问题。
【在 a*****x 的大作中提到】
: 费马数只有两层,而且被证明了不一定是素数。我是想知道多到几层时会都成为素数。
: 以前编程算过,很快溢出了
There are no other known Fermat primes Fn with n > 4. However, little is
known about Fermat numbers with large n. In fact, each of the following is
an open problem:
Is Fn composite for all n > 4?
Are there infinitely many Fermat primes?
Are there infinitely many composite Fermat numbers?
你的这个数是Fermat number的一个特例,如果上述问题解决了,你的问题也就解决了
。当然,这可不是个简单的数学问题。
【在 a*****x 的大作中提到】
: 费马数只有两层,而且被证明了不一定是素数。我是想知道多到几层时会都成为素数。
: 以前编程算过,很快溢出了
a*x
17 楼
我说了费马数只有两层。所以费马数是我的数的特例
a*x
18 楼
你的意思大概是我的数列是费马数的子集。但是我要的结论是是否存在这样形式的数列
,对所有自然数n,都是素数。我没有看到有人提出过或是证明过。当然我比较孤陋寡闻
【在 S**I 的大作中提到】
: 根据wiki:
: There are no other known Fermat primes Fn with n > 4. However, little is
: known about Fermat numbers with large n. In fact, each of the following is
: an open problem:
: Is Fn composite for all n > 4?
: Are there infinitely many Fermat primes?
: Are there infinitely many composite Fermat numbers?
: 你的这个数是Fermat number的一个特例,如果上述问题解决了,你的问题也就解决了
: 。当然,这可不是个简单的数学问题。
,对所有自然数n,都是素数。我没有看到有人提出过或是证明过。当然我比较孤陋寡闻
【在 S**I 的大作中提到】
: 根据wiki:
: There are no other known Fermat primes Fn with n > 4. However, little is
: known about Fermat numbers with large n. In fact, each of the following is
: an open problem:
: Is Fn composite for all n > 4?
: Are there infinitely many Fermat primes?
: Are there infinitely many composite Fermat numbers?
: 你的这个数是Fermat number的一个特例,如果上述问题解决了,你的问题也就解决了
: 。当然,这可不是个简单的数学问题。
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