Pillai's arithmetical function

In number theory, the gcd-sum function,[1] also called Pillai's arithmetical function,[1] is defined for every by

or equivalently[1]

where is a divisor of and is Euler's totient function.

it also can be written as[2]

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.[3]

[4]

References

  1. Lászlo Tóth (2010). "A survey of gcd-sum functions". J. Integer Sequences. 13.
  2. Sum of GCD(k,n)
  3. S. S. Pillai (1933). "On an arithmetic function". Annamalai University Journal. II: 242–248.
  4. Broughan, Kevin (2002). "The gcd-sum function". Journal of Integer Sequences. 4 (Article 01.2.2): 1–19.

OEIS: A018804

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