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Search: id:A032696
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| A032696 |
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Only 6 digits from (1,2,3,4,5,6,7,8,9) can precede a(n) to form a prime. |
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+0
1
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| 3, 57, 297, 2189, 25697, 76721, 123747, 124443, 132653, 218207, 244099, 261023, 267787, 297059, 304389, 346623, 366989, 411971, 462751, 551057, 596897, 643181, 647193, 665967, 671573, 688143, 701207, 742197, 748563, 867003, 872313, 877331
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Finding 7, 8 and 9 preceding digits is a difficult job !
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EXAMPLE
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If a(n) = 57 then we find '1'57, '2'57, '4'57, '5'57, '7'57 and '8'57 to be primes.
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CROSSREFS
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Sequence in context: A051227 A122548 A078728 this_sequence A131466 A060483 A139746
Adjacent sequences: A032693 A032694 A032695 this_sequence A032697 A032698 A032699
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KEYWORD
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nonn
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), May 15, 1998.
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