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Search: id:A069614
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| A069614 |
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a(1) = 2; a(2n) = smallest prime starting ( the most significant digits) with a(2n-1)i.e. (as a right concatenation of a(2n-1) and a number with no insignificant zeros) 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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17
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| 2, 23, 223, 2237, 32237, 3223729, 63223729, 632237297, 2632237297, 263223729721, 12263223729721, 1226322372972173, 171226322372972173, 17122632237297217381, 2117122632237297217381, 21171226322372972173813
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OFFSET
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1,1
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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, A069613.
Sequence in context: A030456 A069837 A069629 this_sequence A036937 A083808 A037750
Adjacent sequences: A069611 A069612 A069613 this_sequence A069615 A069616 A069617
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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 Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 30 2003
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