Unitary perfect number 1970-01-01
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Untouchable number 1970-01-01
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Unusual number 1970-01-01
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Weak ordering 1970-01-01
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Wedderburn–Etherington number 1970-01-01
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Weird number 1970-01-01
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Wilson quotient 1970-01-01
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Wolstenholme number 1970-01-01
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Woodall number 1970-01-01
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Zeisel number 1970-01-01
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Zimmert set 1970-01-01
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Znám's problem 1970-01-01
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