cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A345361 Numbers that are not palindromes even after removing trailing zeros and are divisible by their reverses.

Original entry on oeis.org

510, 540, 810, 2100, 4200, 5100, 5200, 5400, 5610, 5700, 5940, 6300, 8100, 8400, 8712, 8910, 9801, 21000, 23100, 27000, 42000, 46200, 51000, 51510, 52000, 52200, 52800, 54000, 54540, 56100, 56610, 57000, 57200, 59400, 59940, 63000, 65340, 69300, 81000, 81810, 84000, 87120
Offset: 1

Views

Author

Tanya Khovanova, Jun 16 2021

Keywords

Comments

Palindromes with or without trailing zeros are trivially divisible their reverses.
If k is in the sequence then 10*k is in the sequence. - David A. Corneth, Jun 16 2021

Examples

			510 is divisible by its reverse 15. Thus, 510 is in this sequence.
		

Crossrefs

Programs

  • Python
    def pal(s): return s == s[::-1]
    def rmz(s): return s.strip('0')
    def ok(n): s = str(n); return not (pal(s) or pal(rmz(s)) or n%int(s[::-1]))
    print(list(filter(ok, range(82000)))) # Michael S. Branicky, Jun 16 2021