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230;231;232;234;235;236;237;238
Vậy có 8 hợp số có dạng 23a
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Có 8 số:
Đó là: 230;231;232;234;235;236;237;238
Đáp số:8
dạng a1 thì là số có 2 chữ số mà đều là nguyên tố thì có những số là:
11;31;41;61;71
vậy có 4 số nguyên tố cần tìm là:11;31;41;61;71
Có tổng cộng 10 số
Đó là 231;232;233;234;235;236;237;238;239;230