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"2"
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"http://wwwinformationdelightinfo/encyclopedia/entry/Cardinal_number" class="copylinks">Cardinal
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"http://wwwinformationdelightinfo/encyclopedia/entry/Ordinal_number" class="copylinks">Ordinal
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"http://wwwinformationdelightinfo/encyclopedia/entry/Numeral_system" class="copylinks">Numeral System
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"http://wwwinformationdelightinfo/encyclopedia/entry/duodecimal" class="copylinks">Duodecimal
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"http://wwwinformationdelightinfo/encyclopedia/entry/Factorization" class="copylinks">Factorization
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"http://wwwinformationdelightinfo/encyclopedia/entry/Divisor" class="copylinks">Divisor s
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"http://wwwinformationdelightinfo/encyclopedia/entry/Roman_numeral" class="copylinks">Roman Numeral
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"http://wwwinformationdelightinfo/encyclopedia/entry/Binary_numeral_system" class="copylinks">Binary
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"http://wwwinformationdelightinfo/encyclopedia/entry/Octal" class="copylinks">Octal
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"http://wwwinformationdelightinfo/encyclopedia/entry/Duodecimal" class="copylinks">Duodecimal
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"http://wwwinformationdelightinfo/encyclopedia/entry/Hexadecimal" class="copylinks">Hexadecimal
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"2" bgcolor="#FFD0D0" align=center'''Mathematical properties'''
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"http://wwwinformationdelightinfo/encyclopedia/entry/Euler_totient_function" class="copylinks">φ(12) = 4
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"http://wwwinformationdelightinfo/encyclopedia/entry/Tau_function" class="copylinks">τ(12) = 6
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"http://wwwinformationdelightinfo/encyclopedia/entry/Divisor_function" class="copylinks">σ(12) = 28
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"http://wwwinformationdelightinfo/encyclopedia/entry/Pi_function" class="copylinks">π(12) = 5
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"http://wwwinformationdelightinfo/encyclopedia/entry/Möbius_function" class="copylinks">μ(12) = 0
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"http://wwwinformationdelightinfo/encyclopedia/entry/Mertens_function" class="copylinks">''M''(12) = -2
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