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Date: 20-4-2020
1008
Date: 18-12-2020
882
Date: 12-5-2020
627
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A number which is simultaneously a nonagonal number and heptagonal 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 , (88, 104), (12445, 14725), (1767052, 2090804), ... (OEIS A048919 and A048920), giving the nonagonal heptagonal numbers 1, 26884, 542041975, 10928650279834, ... (OEIS A048921).
REFERENCES:
Sloane, N. J. A. Sequences A048919, A048920, and A048921 in "The On-Line Encyclopedia of Integer Sequences."
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