A104226 Product of the smallest and largest n-digit primes.

14, 1067, 100697, 10062757, 1000609937, 100001299949, 10000020999973, 1000001789999791, 100000000699999559, 10000000036999999769, 1000000001669999999563, 100000000001899999999967

Offset

1,1

Links

Table of n, a(n) for n=1..12.

Chris Caldwell, The First 10,000 Primes.

Example

The first term is 14 since it is the product of 2 and 7, which are the smallest and largest 1-digit primes.

Mathematica

NextPrim[n_] := Block[{k = n + 1}, While[ !PrimeQ[k], k++ ]; k]; PrevPrim[n_] := Block[{k = n - 1}, While[ !PrimeQ[k], k-- ]; k]; f[n_] := NextPrim[10^(n - 1)]*PrevPrim[10^n]; Array[f, 13] (* Robert G. Wilson v, Feb 10 2006 *)

Crossrefs

Sequence in context: A227205 A297766 A160011 * A282272 A208395 A132504

Adjacent sequences: A104223 A104224 A104225 * A104227 A104228 A104229

Keyword

nonn,base

Author

Parthasarathy Nambi, Apr 01 2005

Extensions

More terms from Robert G. Wilson v, Feb 10 2006

Status

approved