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

1,1

Links

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

Formula

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

Example

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

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 *)

Crossrefs

Cf. A003617, A003618.

Sequence in context: A363424 A174320 A140159 * A222983 A243075 A232489

Adjacent sequences: A073859 A073860 A073861 * A073863 A073864 A073865

Keyword

base,nonn

Author

Amarnath Murthy, Aug 15 2002

Extensions

More terms from Emeric Deutsch, Mar 28 2005

Status

approved