A073862 Difference between the largest and the smallest n-digit prime.

5, 86, 896, 8964, 89984, 899980, 8999988, 89999970, 899999930, 8999999960, 89999999958, 899999999986, 8999999999932, 89999999999936, 899999999999958, 8999999999999900, 89999999999999936, 899999999999999986, 8999999999999999958, 89999999999999999938

Offset: 1

Author

Amarnath Murthy, Aug 15 2002

Keywords

• base
• nonn

Examples

			a(3) = 997 - 101 = 896.
a(1) = 5 because 7-2 = 5.
		

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A003617, A003618.

Programs

Maple

seq(prevprime(10^n)-nextprime(10^(n-1)), n=1..21); # Emeric Deutsch, Mar 28 2005

Mathematica

Table[NextPrime[10^(n+1),-1]-NextPrime[10^n],{n,0,18}] (* Harvey P. Dale, May 04 2016 *)

Formula

a(n) = A003618(n) - A003617(n).

Extensions

More terms from Emeric Deutsch, Mar 28 2005