Are there any Armstrong numbers (narcissistic numbers) in base 90? Of course, except the one-digit ones. There don't seem to be. Just curious.
2026-04-02 18:45:50.1775155550
Armstrong numbers in base 90
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Try $~\{73\}\{62\}\{15\}\{62\}\{83\}\{18\}\{39\}\{47\}.\quad$ See link.