Happily AloneSeries teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What are the missing numbers?
7, 13, 19, 23, 31, __, __, 103, 109, 139, 167, 193, 239
HintThese numbers are all prime.
These are the first 13 happy prime numbers.
A number is prime when it has exactly 2 whole number divisors: 1 and itself.
A happy number is defined by the following process. Starting with any positive whole number, replace the number by the sum of the squares of its digits, and repeat the process until the number equals 1.
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