Chef and Series

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Chef was talking to his friend about mathematical sequences and his friend gave the first few terms of a sequence to him: 7, 11, 13, 14, 19.... and wanted to know the kth number of the sequence. As this number may be very large, Chef only needs to find the number modulo 109+7. Chef is busy doing his day to day work, so he wants you, his programmer friend, to help by figuring out the pattern and so

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solution.cppC++17

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