Yes
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pi can be written by two adjacent i i and a small _on them like __ 3.141592653 ii
{1, 2}, {7, 8} and {10, 11}. The triangular numbers are 1, 3, 6, 10, 15, 21, 28, ... The sum of two adjacent numbers is odd, so adjacent numbers that sum to 1, 3, 15, 21 are the solution. 1 is impossible, leaving 3, 15 & 21 as possible sums, giving the adjacent numbers {1, 2}, {7, 8} & {10, 11}
One two three four five its that easy..........
Because if two numbers are adjacent, then one of them is odd and one is even. But ' 2 ' is the only even prime number there is.