Partial sums of powers of prime factors. De Koninck, Jean-Marie, Luca, Florian (2007) Journal of Integer Sequences [electronic only]
Perfect numbers and finite groups Tom De Medts, Attila Maróti (2013) Rendiconti del Seminario Matematico della Università di Padova
Perfect, Semiperfect and Ore Numbers Andreas Zachariou, Eleni Zachariou (1972) Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
Periodic, Multiplicative Number-Theoretical Functions. Wolfgang Schwarz (1979) Monatshefte für Mathematik
Periodische und multiplikative zahlentheoretische Funktionen. Dieter Wolke, D. Leitmann (1976) Monatshefte für Mathematik
Polynomials Involving the Floor Function. Inger J. Haland, Donald E. Knuth (1995) Mathematica Scandinavica
Positive integers n such that σ ( ϕ ( n ) ) = σ ( n ) . De Koninck, Jean-Marie, Luca, Florian (2008) Journal of Integer Sequences [electronic only]
Prime numbers such that the sums of the divisors of their powers are perfect power numbers Akira Takaku (1987) Colloquium Mathematicae
Prime numbers such that the sums of the divisors of their powers are perfect squares A. Takaku (1984) Colloquium Mathematicae
Primes in classes of the iterated totient function. Noe, Tony D. (2008) Journal of Integer Sequences [electronic only]
Primitive free quartics with specified norm and trace Stephen D. Cohen, Sophie Huczynska (2003) Acta Arithmetica
Problèmes sur quelques fonctions numériques Bougaïeff (1874) Nouvelles annales de mathématiques : journal des candidats aux écoles polytechnique et normale
Properties of rational arithmetic functions. Laohakosol, Vichian, Pabhapote, Nittiya (2005) International Journal of Mathematics and Mathematical Sciences
Properties of the function f ( x ) = x / π ( x ) . Vlamos, Panayiotis (2001) International Journal of Mathematics and Mathematical Sciences