Volume 7, 2001, Number 1

Volume 7 ▶ Number 1 ▷ Number 2Number 3Number 4


Remarks on φ-, σ-, ψ- and ρ-functions
Original research paper. Pages 1–3
K. Atanassov

On a even perfect and superperfect numbers
Original research paper. Pages 4–5
J. Sándor

On arithmetic functions and a trigonometrical product
Original research paper. Pages 6–9
J. Sándor and L. Tóth

Some new formulae for the twin primes counting function π2(n)
Original research paper. Pages 10–14
M. Vassilev-Missana

Three formulae for n-th prime and six for n-th term of twin primes
Original research paper. Pages 15–20
M. Vassilev-Missana

An analyses of twin primes h2n−1 using modular rings Z6 and Z4
Original research paper. Pages 21–28
J. Leyendekkers and A. Shannon


Volume 7 ▶ Number 1 ▷ Number 2Number 3Number 4

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