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Search: id:A083992
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| A083992 |
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a(1) = 1 then the smallest number such that the forward as well as the reverse n-th partial concatenation is a prime for n>1. (Reverse concatenation is taken term-wise and not digit-wise). |
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4
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| 1, 1, 3, 11, 13, 47, 67, 213, 99, 753, 861, 143, 2187, 249, 193, 2957, 14553, 1557, 2359, 8669, 1491, 1003, 12131, 583, 2643, 3857, 5631, 999, 9693, 10231, 1451, 16861, 6321, 14567, 21649, 7563, 40983, 123, 12579, 57927, 4257, 6777, 359, 3679, 1191, 10139
(list; graph; listen)
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OFFSET
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0,3
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EXAMPLE
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1131113 and 1311311 both are primes as a forward and reverse concatenation of first five terms.(1,1,3,11,13).
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CROSSREFS
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Cf. A083993, A083994.
Sequence in context: A119145 A113049 A079665 this_sequence A105290 A158790 A063963
Adjacent sequences: A083989 A083990 A083991 this_sequence A083993 A083994 A083995
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KEYWORD
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base,hard,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 23 2003
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EXTENSIONS
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More terms from Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 03 2003
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