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Search: id:A160952
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| A160952 |
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a(n)=largest n-digit prime formed by appending a digit to a(n-1); a(0)=2. |
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+0
1
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OFFSET
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1,1
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COMMENT
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There is no prime a(8) since 293999991 to 293999999 are all composite.
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EXAMPLE
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a(0)=2, a(1)=29, a(2)=293, a(3)=2939, a(4)=29399, a(5)=293999, a(6)=2939999, a(7)=29399999.
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MAPLE
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>m:=[n]: print(op(m)); whille nops(m)>0 >do m:=select(isprime, map(proc(x) 10*x+1, 10*x+3, 10*x+7, 10*x+9 > end, m)): print(op(m)): >od:
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CROSSREFS
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Cf. A000040, A160674.
Sequence in context: A124301 A077023 A101750 this_sequence A088615 A091716 A094940
Adjacent sequences: A160949 A160950 A160951 this_sequence A160953 A160954 A160955
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KEYWORD
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base,fini,full,nonn,uned
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AUTHOR
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Vladislav-Stepan Malakhovsky and Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), May 31 2009
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