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Many many answers. Starting with ...

three

3 + 10 = 13

3 + 20 = 23

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47,

53, 59, 61, 67, 71, 73, 79, 83, 89, 97 are prime numbers up to 100

so same with ...

9 (19 and 29)

21 (31 and 41)

27 (37 and 47)

33 (43 and 53)

51 (61 and 71)

63 (73 and 83)

69 (79 and 89)

and so on ...

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6y ago
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Q: If you add 10 or 20 to me then the results is a prime number?
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