2^2^0+1=3 ; 2^2^1+1=5; 2^2^2+1=17 ; 2^2^3+1=257 ; 2^2^4+1=65
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2^2^0+1=3 ; 2^2^1+1=5; 2^2^2+1=17 ; 2^2^3+1=257 ; 2^2^4+1=65537 zhe lie shu zi jiao shen me ne
Does any one know what is the name of the family of these numbers?
Thanks for helping!
Does any one know what is the name of the family of these numbers?
Thanks for helping!
这叫费马数
其中前五个是素数,叫做费马素数
其中前五个是素数,叫做费马素数
观察1^2-0^2=1;2^2-1^2=3;3^2-2^2=5;4^2-3^2=7;5^2-4^2=9;6^2-5^2=
1+2+3-4-5+1+1+2+3=
(1)1+2+1=4;1+2+3+2+1=_______;1+2+3+4+3+2+1=_______;1+2+3+4+5
巧填符号 2 2 2 2 2=0 2 2 2 2 2=1 2 2 2 2 2=2 2 2 2 2 2=3 2 2 2 2
2/3[2/3(1/4x-1)+2]-5/2=2/3x
1.1+2^1=2-1分之2^2-1 2.1+2^1+2^2+2^3=15=2-1分之2^4-1
1 2 3 4 5=1
1=1²,1+2+1=2²,1+2+3+2+1=3²,1+2+3+4+3+2+1=4
S1=1-2/3,S2=(1-2/3)(1-2/4),S3==(1-2/3)(1-2/4)(1-2/5),猜想Sn
1 2 3 2 1 1 3 设A= { 2 2 1 },B= { 5 3 },C= { 2 0 } 3 4 3 3 1
1+2=3 4+5=?
设S1=1+1/(1^2)+1/(2^2),S2=1+1/(2^2)+1/(3^2),S3=1+1/(3^2)+1/(4