Solve -2*i + 270*d = 271*d - 3, 20 = 4*d for i.
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What is the c'th term of -17, -26, -53, -110, -209, -362, -581?
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What is the y'th term of 11, 13, 15, 17?
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What is the k'th term of 16486, 16489, 16494, 16501, 16510?
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What is the n'th term of -99, -151, -213, -291, -391, -519, -681?
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What is the u'th term of -1647, -1676, -1703, -1728?
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What is the u'th term of -255, -259, -263, -267, -271?
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