Rational sequences

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A rational sequence is a sequence of rational numbers. For example, the fourth Farey series $0,{\frac {1}{4}},{\frac {1}{3}},{\frac {1}{2}},{\frac {2}{3}},{\frac {3}{4}},1$ is a rational sequence. Integer sequences are a special case of rational sequences.

In the OEIS, rational sequences are typically entered as two sequences: one for numerators and one for denominators. Both receive the keyword frac.