Series
Level
pending
4, 6, 12, 18, 30, 42, 60, 72, 102, 108, ?, ?, ? What is the sum of next 3.
The answer is 468.
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1 solution
The series lists numbers that are preceded and followed by two prime numbers.
4 ( 3 and 5 ) 6 ( 5 and 7 ) 1 2 ( 1 1 and 1 3 ) 1 8 ( 1 7 and 1 9 ) 3 0 ( 2 9 and 3 1 ) 4 2 ( 4 1 and 4 3 ) 6 0 ( 5 9 and 6 1 ) 7 2 ( 7 1 and 7 3 ) 1 0 2 ( 1 0 1 and 1 0 3 ) 1 0 8 ( 1 0 7 and 1 0 9 )
Thus, the next three terms are
1 3 8 ( 1 3 7 and 1 3 9 ) 1 5 0 ( 1 4 9 and 1 5 1 ) 1 8 0 ( 1 7 9 and 1 8 1 )
Hence, the sum = 4 6 8