A160673 a(n)=smallest n-digit prime formed by appending a digit to a(n-1); a(7)=8402963.

8402963, 84029633, 840296333, 8402963339, 84029633399, 840296333999, 8402963339993, 84029633399939, 840296333999393, 8402963339993933

Offset

7,1

Links

Table of n, a(n) for n=7..16.

Maple

A160673 := proc(n)
        if n = 7 then
                8402963;
        else
                for d from 1 to 9 by 2 do
                        if isprime(10*procname(n-1)+d )then
                                return 10*procname(n-1)+d ;
                        end if;
                end do:
                return -1 ;
        end if;
end proc:
for n from 7 to 17 do
        printf("%d, \n", A160673(n)) ;
end do: # R. J. Mathar, Oct 15 2011

Crossrefs

Cf. A000040.

Sequence in context: A013971 A036101 A283031 * A283032 A049362 A251119

Adjacent sequences: A160670 A160671 A160672 * A160674 A160675 A160676

Keyword

base,easy,fini,full,nonn,less

Author

Vladislav-Stepan Malakhovsky and Juri-Stepan Gerasimov, May 23 2009

Extensions

Corrected by R. J. Mathar, Oct 15 2011

Status

approved