A160751 a(n) is the smallest n-digit prime formed by appending a digit to a(n-1); a(1)=6.

6, 61, 613, 6131

Offset: 1

Author

Juri-Stepan Gerasimov, May 25 2009

Keywords

• base
• easy
• fini
• full
• nonn

Comments

There is no prime a(5) since all the integers from 61310 to 61319 are composite.

Crossrefs

Cf. A000040, A160674.

Programs

Maple

A160751 := proc(n) option remember ; local d; if n =1 then 6; else for d from 1 to 9 by 2 do if isprime(10*procname(n-1)+d) then RETURN( 10*procname(n-1)+d ) ; fi; od: RETURN(-1) ; fi; end: seq(A160751(n),n=1..10) ; # R. J. Mathar, May 26 2009

Extensions

Corrected by R. J. Mathar, May 26 2009