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In number theory, the gcd-sum function,also called Pillai's arithmetical function, is defined for every by or equivalently where is a divisor of and is Euler's totient function. it also can be written as where, is the divisor function, and is the Möbius function. This multiplicative arithmetical function was introduced by the Indian mathematician Subbayya Sivasankaranarayana Pillai in 1933.

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  • In number theory, the gcd-sum function,also called Pillai's arithmetical function, is defined for every by or equivalently where is a divisor of and is Euler's totient function. it also can be written as where, is the divisor function, and is the Möbius function. This multiplicative arithmetical function was introduced by the Indian mathematician Subbayya Sivasankaranarayana Pillai in 1933. (en)
  • Inom talteori är Pillai aritmetiska funktion en aritmetisk funktion definierad som eller ekvivalent där är Eulers fi-funktion. Av den sista representationen ser man att den är en multiplikativ funktion. Funktionen introducerades av den indiska matematikern 1933. (sv)
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  • In number theory, the gcd-sum function,also called Pillai's arithmetical function, is defined for every by or equivalently where is a divisor of and is Euler's totient function. it also can be written as where, is the divisor function, and is the Möbius function. This multiplicative arithmetical function was introduced by the Indian mathematician Subbayya Sivasankaranarayana Pillai in 1933. (en)
  • Inom talteori är Pillai aritmetiska funktion en aritmetisk funktion definierad som eller ekvivalent där är Eulers fi-funktion. Av den sista representationen ser man att den är en multiplikativ funktion. Funktionen introducerades av den indiska matematikern 1933. (sv)
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  • Pillai's arithmetical function (en)
  • Pillais aritmetiska funktion (sv)
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