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1595. To find each digit in the sequence you have to reverse the numbers (for example , 13 reversed is 31), then add that number to the original (for example the original is 13), so the next number in the sequence is 31 + 13 = 44, and so on. It is palindromic.
44
44
44 this is based on a sequence of doubling the initial number then adding 2 to that result.
44. You're adding 11 then 9 each time !