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Those are the factors of the number 60, in descending order. The next factor is 10.
71,73 and 101,103 are the next two twin primes after 60.
The next number should be 80.
10 The sequence is given by xn = 60/n
It is difficult to be specific because busy street traffic and quiet radio are not standard volumes of sound.However, a quiet radio - at around a "normal" conversation level is 60 decibels (dB). A busy street is can range from the low 70 to high 80 dB. Let us say 80 dB.The difference is 20 dB = 2 Bels. This means the street is 10^2 = 100 times as loud.