; 8424432925592889329288197322308900672459420460792433
(define (f n) (gcd (+ (expt n 17) 9) (+ (expt (+ n 1) 17) 9)))
(display (f 42)) (newline)
(display (f 8424432925592889329288197322308900672459420460792433)) (newline)
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