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Search: id:A069613
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| A069613 |
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a(1) = 1; a(2n) = smallest prime starting ( the most significant digits) with a(2n-1). and a(2n+1) = smallest prime ending in ( the least significant digits) a(2n-1). Alternate left and right concatenation yielding primes. |
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9
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| 1, 11, 211, 2111, 22111, 2211127, 12211127, 122111279, 14122111279, 1412211127927, 211412211127927, 21141221112792721, 1321141221112792721, 132114122111279272169, 27132114122111279272169, 2713211412211127927216947
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OFFSET
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1,2
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EXAMPLE
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a(4) = 2111 staring with a(3) =211 and a(5) = 22111 ending in a(4) = 2111.
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CROSSREFS
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Cf. A053582, A069605, A069606, A069607, A069608, A069609, A069610, A069611.
Adjacent sequences: A069610 A069611 A069612 this_sequence A069614 A069615 A069616
Sequence in context: A124991 A068836 A069628 this_sequence A075858 A136307 A038399
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KEYWORD
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nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 27 2002
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EXTENSIONS
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More terms from Robert Gerbicz (gerbicz(AT)freemail.hu), Aug 27 2002
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