A089691 a={1,3,7,9} a1={1,3,7,9,0} b[n]=Flatten[Table[10*Sum[10^m*a1[[1+Mod[m,5]]],{m,0,n}]+a,{n,0,digits}]]; a(m) = if b[n] is prime then b[n]

11, 13, 17, 19, 311, 313, 317, 31097317, 731097313, 109731097319, 73109731097317, 7310973109731097319, 10973109731097310973109731097310973109731097317, 31097310973109731097310973109731097310973109731097317

Offset

1,1

Comments

A sum and digit set based prime generator function.

Links

Table of n, a(n) for n=1..14.

Mathematica

a={1, 3, 7, 9} a1={1, 3, 7, 9, 0} digits=100 b=Flatten[Table[10*Sum[10^m*a1[[1+Mod[m, 5]]], {m, 0, n}]+a, {n, 0, digits}]]; d=Delete[Union[c], 1]

Crossrefs

Sequence in context: A240899 A090149 A337834 * A036979 A036977 A120168

Adjacent sequences: A089688 A089689 A089690 * A089692 A089693 A089694

Keyword

nonn,base,less

Author

Roger L. Bagula, Jan 05 2004

Status

approved