7 citations · 16 across the 11 of their papers we have counts for
11 papers
Long Solutions of Sequence A348480 of the On-Line Encyclopedia of Integer Sequences
Rüdiger Jehn
For numbers coprime to there exist infinitely many binary numbers such that the greatest common divisor of and rev() = and the sum of digits of (rev…
Optimum Strategies for the Game Super Six
Rüdiger Jehn
In the game "Super Six", after successfully getting rid of a stick by rolling with the die a number that is not occupied, the player has the choice to continue to roll the die or t…
Properties of terms of OEIS A342810
Rüdiger Jehn, Kester Habermann
The OEIS sequence A342810 contains the numbers that divide the smallest number that has the sum of their digits. It is proved that if a term has the form where $…
Porous Numbers
Rüdiger Jehn
The concept of porous numbers is presented. A number which is not a multiple of 10 is called {\it porous} if every number with sum of digits = and a divisor of both…
Properties of Hamiltonian Circuits in Rectangular Grids
Rüdiger Jehn
We present properties and invariants of Hamiltonian circuits in rectangular grids. It is proved that all circuits on a chessboard have at least turns and at lea…
A systematic ranging technique for follow-ups of NEOs detected with the Flyeye telescope
Michael Frühauf, Marco Micheli, Toni Santana-Ros +3
When new objects are detected in the sky, an orbit determination needs to be performed immediately to find out their origin, to determine the probability of an Earth impact and pos…