What is the x'th term of 0, 21, 54, 99, 156, 225?
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What is the d'th term of 249, 255, 261, 267?
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What is the f'th term of 81, 126, 171, 216, 261?
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What is the u'th term of -47, -11, 41, 103, 169, 233, 289?
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What is the f'th term of 3, 18, 45, 90, 159, 258?
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What is the p'th term of 121, 113, 101, 85, 65, 41?
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What is the r'th term of 167, 162, 137, 80, -21?
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What is the a'th term of -325, -651, -977?
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What is the p'th term of -19, -15, -1, 29, 81, 161, 275?
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What is the q'th term of -1830, -3662, -5494, -7326, -9158?
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What is the b'th term of -53, -173, -379, -677, -1073, -1573, -2183, -2909?
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What is the b'th term of 665, 1330, 1995, 2660, 3325, 3990?
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What is the m'th term of -259, -256, -259, -274, -307, -364, -451?
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