?

\[\log \left(N + 1\right) - \log N \]

(FPCore (N) :precision binary64 (- (log (+ N 1.0)) (log N)))

double code(double N) {
	return log((N + 1.0)) - log(N);
}

real(8) function code(n)
    real(8), intent (in) :: n
    code = log((n + 1.0d0)) - log(n)
end function

public static double code(double N) {
	return Math.log((N + 1.0)) - Math.log(N);
}

def code(N):
	return math.log((N + 1.0)) - math.log(N)

function code(N)
	return Float64(log(Float64(N + 1.0)) - log(N))
end

function tmp = code(N)
	tmp = log((N + 1.0)) - log(N);
end

code[N_] := N[(N[Log[N[(N + 1.0), $MachinePrecision]], $MachinePrecision] - N[Log[N], $MachinePrecision]), $MachinePrecision]

\log \left(N + 1\right) - \log N

Reproduce?

Please include this information when filing a bug report:

herbie shell --seed 2023241 
(FPCore (N)
  :name "2log (problem 3.3.6)"
  :precision binary64
  (- (log (+ N 1.0)) (log N)))

match: no matching clause for 'ival		L	C
compile-progs	/home/nightlies/herbie/arb-support/src/programs.rkt	122	0
make-search-func	/home/nightlies/herbie/arb-support/src/ground-truth.rkt	20	0
sample-points	/home/nightlies/herbie/arb-support/src/ground-truth.rkt	64	0
setup-context!	/home/nightlies/herbie/arb-support/src/mainloop.rkt	293	0
get-alternatives/report	/home/nightlies/herbie/arb-support/src/sandbox.rkt	148	0
(unnamed)	/home/nightlies/herbie/arb-support/src/sandbox.rkt	247	6
(unnamed)	/usr/share/racket/pkgs/profile-lib/main.rkt	40	10
profile-thunk	/usr/share/racket/pkgs/profile-lib/main.rkt	9	0
(unnamed)	/usr/share/racket/collects/racket/engine.rkt	42	24