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(1612 (-21)^n + 30685 2^(5 + 2 n) 3^n - 1082829 13^n + 8349 17^(1 + n))/42636 mod 10^10000 when n=2e7
(1612 (-21)^n + 30685 2^(5 + 2 n) 3^n - 1082829 13^n + 8349 17^(1 + n))/42636 mod 10^10000 when n=2e7
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