计算2+2+3+4+6+9+14+22+35+56+......共20项的和
时间: 2023-12-14 12:33:02 浏览: 192
根据提供的引用,我们可以看出这是一个斐波那契数列的变形,每一项都是前两项之和,但是从第三项开始,每一项都比前一项多1。因此,我们可以先计算出前20项的值,然后将它们相加即可得到答案。
以下是计算过程:
第1项:2
第2项:2
第3项:2+2+1=5
第4项:2+3+2=7
第5项:3+4+3=10
第6项:4+6+4=14
第7项:6+9+5=20
第8项:9+14+6=29
第9项:14+22+7=43
第10项:22+35+8=65
第11项:35+56+9=100
第12项:56+90+10=156
第13项:90+146+11=247
第14项:146+236+12=394
第15项:236+382+13=631
第16项:382+618+14=1014
第17项:618+1000+15=1633
第18项:1000+1618+16=2634
第19项:1618+2618+17=4253
第20项:2618+4236+18=6840
因此,前20项的和为:2+2+5+7+10+14+20+29+43+65+100+156+247+394+631+1014+1633+2634+4253+6840=18422。
相关问题
1 package com.alibaba.traffic.web; 2 3 import java.io.UnsupportedEncodingException; 4 import java.security.InvalidKeyException; 5 import java.security.NoSuchAlgorithmException; 6 7 import javax.crypto.Mac; 8 import javax.crypto.SecretKey; 9 import javax.crypto.spec.SecretKeySpec; 10 11 import org.apache.commons.codec.binary.Hex; 12 特别注意 附件 6 13 /** 14 * @author dongdong.fdd 15 * @date 2018/9/27 上午11:29 16 */ 17 public class T { 18 public static void main(String[] args) 19 throws InvalidKeyException, UnsupportedEncodingException, No SuchAlgorithmException { 20 long timestamp = System.currentTimeMillis() / 1000; 21 String paramValuesStr = "allAMAP-TRAFFIC-BRAIN10" + timestam p;//该值为排好序的参数的参数值拼接结果 22 String clientSecret = "testclientsecret";//该值为申请到的client Secret 23 24 Mac mac = Mac.getInstance("HmacSHA256"); 25 byte[] secretByte = clientSecret.getBytes("UTF-8"); 26 byte[] dataBytes = paramValuesStr.getBytes("UTF-8"); 27 28 SecretKey secretKey = new SecretKeySpec(secretByte,"HMACSHA2 56"); 29 mac.init(secretKey); 30 31 byte[] doFinal = mac.doFinal(dataBytes); 32 byte[] hexB = new Hex().encode(doFinal); 33 34 String digest = new String(hexB, "utf-8");//计算好的签名 26f2042cde2e9ca01d41ecdb27a91fd9b84f0263c411bcb13b195ec589096885 35 System.out.println(digest); 36 37 String resultUrl = "http://et-api.amap.com/index/cityRankin g?adcodes=all&clientKey=AMAP-TRAFFIC-BRAIN&size=10×tamp="+times tamp+"&digest=" + digest; 38 System.out.println(resultUrl); 39 } 将这段代码使用python实现
你可以使用以下代码将该Java代码转换为Python代码:
```python
import hashlib
import hmac
import time
param_values_str = "allAMAP-TRAFFIC-BRAIN10" + str(int(time.time()))
client_secret = "testclientsecret"
secret_byte = client_secret.encode('utf-8')
data_bytes = param_values_str.encode('utf-8')
digest = hmac.new(secret_byte, data_bytes, hashlib.sha256).hexdigest()
timestamp = int(time.time())
result_url = f"http://et-api.amap.com/index/cityRanking?adcodes=all&clientKey=AMAP-TRAFFIC-BRAIN&size=10×tamp={timestamp}&digest={digest}"
print(result_url)
```
这段Python代码将会产生与Java代码中 `resultUrl` 相同的结果。需要注意的是,Python中没有直接对应 `javax.crypto.Mac` 的库,因此我们使用了 `hmac` 模块来进行哈希运算。
62:11,19,23,24,26,33,15; 61:1,4,6,11,12,22,15; 60:9,11,17,19,30,31,11; 59:2,6,13,22,27,32,6; 58:10,17,22,26,30,33,11; 57:2,5,10,17,24,32,3; 56:8,14,15,18,23,33,8; 55:3,4,20,23,27,32,13; 54:5,6,9,10,15,26,12; 53:1,7,14,20,27,30,15; 52:3,4,5,8,12,17,6; 51:22,26,29,30,32,33,14; 50:2,7,9,14,22,23,5; 49:5,7,14,23,25,27,2; 48:2,3,10,24,28,30,8; 47:5,7,14,23,31,33,7; 46:6,8,17,25,26,28,3; 45:3,6,12,21,27,28,4; 44:2,8,15,22,24,26,16; 43:5,8,12,20,24,28,10; 42:10,17,20,23,27,30,10; 41:1,6,12,13,15,24,6; 40:9,16,17,24,29,31,8; 39:2,3,9,13,19,28,9; 38:2,9,14,17,31,33,8; 37:8,23,25,26,29,31,12; 36:13,14,18,19,24,30,9; 35:1,4,9,10,20,33,6; 34:2,3,9,11,12,17,15; 33:8,9,13,23,24,26,5; 32:6,19,20,26,28,33,1; 31:7,14,27,29,31,33,5; 30:2,3,7,16,30,31,6; 29:3,7,12,24,28,33,8; 28:5,7,10,17,20,22,14; 27:8,10,22,27,32,33,8; 26:1,18,26,30,31,33,3; 25:4,16,20,21,31,32,14; 24:3,6,9,17,27,28,3; 23:5,8,10,15,24,25,9; 22:10,11,18,19,23,31,3; 21:2,5,6,19,21,27,4; 20:1,12,17,18,26,27,5; 19:6,12,26,28,29,32,15; 18:10,12,17,19,25,31,13; 17:5,11,18,20,26,28,12; 16:14,16,19,23,28,30,3; 15:2,3,14,21,29,32,8; 14:6,7,18,23,27,30,5; 13:6,10,14,22,23,33,13; 12:3,4,7,22,26,30,6; 11:6,7,16,17,21,22,4; 10:4,5,13,18,27,29,12; 09:3,4,19,23,30,32,6; 08:5,13,18,20,26,28,6; 07:5,6,9,22,25,31,3; 06:2,10,12,14,24,26,5; 05:2,6,8,13,14,19,16; 04:1,7,15,16,20,25,16; 03:5,8,18,25,30,32,6; 02:2,6,10,16,18,22,13; 01:9,16,18,22,28,32,2; 请预测下一组数据
根据你提供的数据,我进行了分析。根据之前的方法,计算前6个数字的平均值为20。因此,下一组数据的前六个数字应该是从01-33中选择的,并且这六个数字的平均值为20。最后一个数字应该是从01-16中选择的。
根据这个规律,我预测下一组数据为:
64: 4, 11, 18, 19, 21, 31, 9
需要注意的是,这只是一种基于数据分析得出的预测结果,并不能保证100%准确。
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