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 A160955 a(n+1) is the largest prime formed by appending a single digit to a(n); a(1)=18. 2
 18, 181, 1811, 18119, 181199, 1811993 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There is no prime a(7) since 18119930 to 18119939 are all composite. LINKS EXAMPLE a(1)=18, a(2)=181, a(3)=1811, a(4)=18119, a(5)=181199, a(6)=1811993. [Corrected by Jon E. Schoenfield, Feb 18 2019] MAPLE A160955 :=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(A160955(n), n=1..10) ; # R. J. Mathar, May 26 2009 CROSSREFS Cf. A000040, A160751, A160954. Sequence in context: A199299 A155669 A160954 * A026091 A178260 A296778 Adjacent sequences:  A160952 A160953 A160954 * A160956 A160957 A160958 KEYWORD nonn,base,easy,fini,full AUTHOR Juri-Stepan Gerasimov, May 31 2009 EXTENSIONS Redundant part of the definition removed by R. J. Mathar, May 21 2010 STATUS approved

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Last modified February 19 10:03 EST 2020. Contains 332041 sequences. (Running on oeis4.)