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Prime

11 x 11 121
12 x 12 144
13*13 169
14*14 196
15*15 225
16*16 256
17*17 289
18*18 324
19*19 361
Prime = 1a 11 - 13 - 17 - 19
Perfect square là gì? Là số chính phương - số có thể viết dưới dạng bình phương của số khác
Số ước của một số n=a^x.b^y.c^z tình bằng cách nào? số ước = (x+1)(y+1)(z+1) NOTE: this will include 1 and n itself.
prime factor của 143 143 = 11 *13
Nếu X có số factors là 3,5,7.. (odd) thì đó là số chính phương
Nếu X là số chính phương số lượng factors của X là 1 số lẻ
Nếu X có số lượng factors là chẵn thì số đó không thể viết dưới dạng bình phương của 1 số khác
Prime nhỏ hơn 10 2-3-5-7
Prime 2a 23 - 29
Prime 3a 31 - 37
Prime 4a 41-43-47
Prime 5a 53-59
Prime 6a 61-67
Prime 7a 71 -73-79
Prime 8a 83 -89
Prime 9a 97
Prime 10a 101
For any positive integer n, n>1, the "length" of n is the number of positive primes (not necessary distinct) whose product is n. For ex, the length of 50 is 3, since 50=2x5x5. What is the greatest possible length of a positive integer less than 1000 To maximize the length you should use the smallest prime number, 2. 2x2x2x2x2x2x2x2x2 = 2^9 = 512; 2^10 = 1024 which is > 1000, so you have to use 2^9.
2^10 = ? 1024
Nếu n: odd, để value của n/k is midway between consecutive integers thì k=? Midway between consecutive integer thì có phần lẻ là 0.5 2.5; 3.5;..) --> k bằng 2
What is the least integer that is a sum of three different primes each greater than 20? 69 - 73 - 75 - 79 - 83 A Prime number is a positive integer with exactly two distinct natural number divisors: 1 and itself. Primes greater than 20 are 23, 29, 31, 37, ... The least integer that is a sum of three different primes each greater than 20 is thus 23 + 29 + 31 = 83. Answer: E.
Created by: Vanessaphan105
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