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A096499 Difference between prime following and prime preceding n-th repunit. 7

%I

%S 6,4,8,20,10,60,16,4,24,54,46,46,70,176,84,12,40,134,104,104,92,24,84,

%T 270,300,130,414,90,88,240,148,198,12,64,12,300,66,70,80,102,420,142,

%U 630,140,600,88,176,312,80,96,460,132,420,284,144,408,312,180,44,300

%N Difference between prime following and prime preceding n-th repunit.

%F a(n) = A096497(n) - A096498(n) = A096869(n) + A096870(n).

%e n=2: 2nd repunit=11, 13-7=6=a[2].

%t <<NumberTheory`NumberTheoryFunctions` Table[NextPrime[(10^n-1)/9]-PreviousPrime[(10^n-1)/9], {n, 2, 100}]

%t dpf[n_]:=Module[{ru=FromDigits[PadRight[{},n,1]]},NextPrime[ru]-NextPrime[ ru,-1]]; Array[dpf,60,2] (* _Harvey P. Dale_, Sep 06 2015 *)

%Y Cf. A068693, A002275, A096497, A096498.

%K nonn

%O 2,1

%A _Labos Elemer_, Jul 09 2004

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Last modified July 15 16:29 EDT 2019. Contains 325049 sequences. (Running on oeis4.)