Porous Numbers
General Mathematics
2021-04-07 v1
Abstract
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 and digit reversal of has a zero in its digits. It is proved that 11, 37, 74, 101 and 121 are the only porous numbers smaller than 1000.
Keywords
Cite
@article{arxiv.2104.02482,
title = {Porous Numbers},
author = {Rüdiger Jehn},
journal= {arXiv preprint arXiv:2104.02482},
year = {2021}
}
Comments
9 pages