a là số nguyên tố
b là hợp số
c cũng là hợp số
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Các câu hỏi tương tự
1.cac so sau la so nguyen to hay hop so
a,A=11.........1(2001 chữ số 1)
b,B=11..........1(2000 chu so 1)
c,C=1010101
Cho A= 2222.....22000...000111...11(co 100 chu so 2, 100 chu so 0 , 100 chu so 1 )
Hoi A la so nguyen to hay hop so ? taisao?
Ban nao dung minh se tich
Bai 1Tim nguyen to a de 4a+11 la so nguyen to nho hon 30
Bai 2 cac so sau la so nguyen to hay so hop so:
a=1*3*5*7*....*13+20
b=147*247*347-13
Bai 1:tim so nguyen P biet P+2va P+4 deu la nguyen to
bai 2: tong 2^100×7×11+81^3 la nguen to hay hop so ( giai thich)
Bai 3: tim so nguyen to P de P +2,p+6,P+8 deu la cac so nguyen to
cho so sau , so nao la so nguyen to ,so nao la hop so:
A=aaaa........a ( 2016 so a )
B=80^2 - 79 . 80 + 1601
A = 11111...111 co tat ca 2002 chu so 1 .Hoi A la hop so hay so nguyen to
cac so sau la so nguyen to hay hop so:
a)a=1.3.5.7.13+20
b)b=147.247.347-1
cho so nguyen to p va mot trong hai s 8p+1 va 8p-1 la so nguyen to ,so con lai la so nguyen to hay hop so?
tong sau la so nguyen to hay hop so
a, 3.5.7.9.11+11.35
b,5.6.7.8+9.77
c,105 +11