

A160954


a(n+1) is the smallest prime formed by appending a single digit to a(n); a(1)=18.


2




OFFSET

1,1


COMMENTS

There is no prime a(7) since 18119390 to 18119399 are all composite.


LINKS

Table of n, a(n) for n=1..6.


EXAMPLE

a(1)=18,
a(2)=181,
a(3)=1811,
a(4)=18119,
a(5)=181193,
a(6)=1811939. [Corrected by Jon E. Schoenfield, Feb 18 2019]


MAPLE

A160954 :=proc(n) option remember ; local d; if n =1 then 18; else for d from 1 to 9 by 2 do if isprime(10*prochame n+d) then RETURN(10*procnam n+d 0 ; fi; end:
seq(A160954(n), n=1..10) ; R. J. Mathar, May 26 2009


CROSSREFS

Cf. A000040, A160751, A160955.
Sequence in context: A140325 A199299 A155669 * A160955 A026091 A178260
Adjacent sequences: A160951 A160952 A160953 * A160955 A160956 A160957


KEYWORD

nonn,base,easy,fini,full


AUTHOR

JuriStepan Gerasimov, May 31 2009


EXTENSIONS

Redundant part of the definition removed by R. J. Mathar, May 21 2010


STATUS

approved



