1, 3, 6, 55, 66...Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What are the next three numbers in this series?
1, 3, 6, 55, 66, 171, 595, 666, 3003, 5995, ?, ?, ?
Answer8778, 15051, 66066
These are the 1st 13 palindromic triangular numbers.
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