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Search: id:A069615
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| A069615 |
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a(1) = 3; a(2n) = smallest prime starting (in 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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+0
8
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| 3, 31, 131, 1319, 21319, 213193, 12213193, 122131939, 1122131939, 112213193957, 27112213193957, 271122131939573, 3271122131939573, 327112213193957339, 2327112213193957339, 232711221319395733969, 13232711221319395733969
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(4) = 1319 staring with a(3) = 131 and a(5) = 21319 ending in a(4) = 1319.
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CROSSREFS
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Cf. A053582, A069605, A069606, A069607, A069608, A069609, A069610, A069611, A069613, A069614.
Sequence in context: A096060 A119682 A069630 this_sequence A087389 A064055 A078604
Adjacent sequences: A069612 A069613 A069614 this_sequence A069616 A069617 A069618
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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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