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A160955
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a(n+1) is the largest prime formed by appending a single digit to a(n); a(1)=18.
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2
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OFFSET
| 1,1
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COMMENTS
| There is no prime a(7) since 18119930 to 18119939 are all composite.
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EXAMPLE
| a(1)=18, a(2)=181, a(4)=1811, a(5)=18119, a(6)=181199, a(7)=1811993.
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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)
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CROSSREFS
| Cf. A000040, A160751, A160954.
Sequence in context: A199299 A155669 A160954 * A026091 A178260 A155665
Adjacent sequences: A160952 A160953 A160954 * A160956 A160957 A160958
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KEYWORD
| nonn,base,easy,fini,full
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), May 31 2009
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EXTENSIONS
| Redundant part of the definition removed - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 21 2010
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