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Pedja
  • Member for 10 years, 5 months
  • Last seen more than a month ago
4 votes
1 answer
204 views

An infinite series involving Jordan's totient function

3 votes
0 answers
1k views

Formula for $\pi$ involving exponents of Mersenne primes

3 votes
1 answer
158 views

The product of the lengths of two line segments that belong to Newton line [closed]

3 votes
1 answer
123 views

Collinearity of three significant points of bicentric pentagon

3 votes
1 answer
103 views

Equal sums of line segments

3 votes
2 answers
275 views

Four concyclic points inside bicentric quadrilateral

3 votes
0 answers
266 views

Conjectured primality test for numbers of the form $N=4 \cdot 3^n-1$

3 votes
1 answer
384 views

Primality test for specific class of $N=k \cdot b^n-1$

2 votes
1 answer
840 views

Primality test for generalized Fermat numbers

2 votes
1 answer
366 views

Primality test for specific class of $N=8kp^n-1$

2 votes
0 answers
306 views

Conjectured initial values of Inkeri's primality test for Fermat numbers

2 votes
2 answers
247 views

Six concyclic points

2 votes
2 answers
537 views

A generalization of Napoleon's theorem

2 votes
1 answer
184 views

Four concyclic triangle centers

2 votes
1 answer
202 views

The centroid, the first and second Napoleon points and $X(930)$ lie on a circle

2 votes
0 answers
83 views

Principal diagonals of octagon meet in a single point

2 votes
1 answer
802 views

Three circles meet at a point [closed]

1 vote
1 answer
111 views

Collinearity in tangential pentagon [closed]

1 vote
1 answer
320 views

A formula for the area of bicentric quadrilateral

1 vote
1 answer
319 views

A generalization of Harcourt's theorem

1 vote
1 answer
159 views

Generalizing Bottema's theorem

1 vote
1 answer
84 views

Equal products of triangle areas

1 vote
0 answers
93 views

Primality test for specific class of $N=12k \cdot 5^n-1$

1 vote
0 answers
47 views

What is the most efficient algorithm for calculating $\Phi_q(b) \operatorname{mod} N$?

1 vote
0 answers
118 views

A primality criterion for specific class of $N=4kp^n+1$

1 vote
1 answer
362 views

Primality test for numbers of the form $4k+3$

0 votes
0 answers
123 views

Testing the primality of Mersenne and Fermat numbers using third order recurrence relation

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