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Date: 12-11-2019
696
Date: 14-10-2020
653
Date: 21-11-2020
584
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A number which is simultaneously a nonagonal number and octagonal number and therefore satisfies the Diophantine equation
(1) |
Completing the square and rearranging gives
(2) |
Defining and gives the Pell-like equation
(3) |
The first integral solutions in and are , (425, 459), (286209, 309141), (192904201, 208360351), ... (OEIS A048922 and A048923), giving the nonagonal octagonal numbers 1, 631125, 286703855361, 130242107189808901, ... (OEIS A048924).
REFERENCES:
Sloane, N. J. A. Sequences A048922, A048923, and A048924 in "The On-Line Encyclopedia of Integer Sequences."
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