a prime number

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# Clue Answer As Given Value Round Category Air Date Show
In 1952 an early computer was used to discover the 13th Mersenne one of these numbers a prime number DD $3,000 DJ TEEN MATH 2018-11-07 #7858
Multiply 2 of these integers, like 3 & 7, & you get a "semi" one, like 21 a prime number $800 DJ YOU KNEW THERE'D BE MATH 2018-04-18 #7743
Euclid provided a proof that the number of these is infinite; in 1992 one with 227,832 digits was found a prime number $500 J MATH 1994-10-13 #2324
A number that can be divided only by itself & 1, such as 7 a prime number $400 J MATHEMATICS 1986-01-30 #364
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