Keyboard shortcuts

Press ← or → to navigate between chapters

Press ? to show this help

Press Esc to hide this help

Metadata 
bibkey: wu2014a249621
authors: Chai Wah Wu
year: 2014
title: "OEIS A249621, Squares that remain squares when prepended with 1 and appended with 25 in base 10"
doi: null
url: https://oeis.org/A249621
claim: "A249621 %N: Squares that remain squares when prepended with 1 and appended with 25 in base 10. A249621 %C: Conjecture: all the numbers in the sequence end in either 00 or 56. - _Chai Wah Wu_, Nov 02 2014"
strata_touched:
  - D5/S1/Digit/Admissibility/SquarePrependOneAppendTwentyFive
license: citation-only
triage: anchor

OEIS A249621

Chai Wah Wu’s 2014 entry studies squares that remain squares after the base-ten operation of prepending 1 and appending 25. The entry conjectures that every such positive square ends in 00 or 56.

Verified locator

  • URL: https://oeis.org/A249621
  • Locator: COMMENTS, “Conjecture: all the numbers in the sequence end in either 00 or 56.” - Chai Wah Wu, Nov 02 2014