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Search: id:A099749
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| A099749 |
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The number defined by the decimal string "a(2n) 1's followed by a(2n+1)" is prime. |
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+0
1
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| 1, 1, 1, 3, 1, 7, 1, 9, 2, 3, 3, 7, 4, 3, 4, 7, 4, 9, 5, 9, 7, 7, 7, 9, 8, 3, 10, 3, 16, 9, 18, 1, 22, 1, 22, 7, 23, 3, 28, 7, 39, 7, 49, 9, 83, 3, 130, 7, 135, 7, 214, 7, 220, 3, 316, 1, 610, 7, 683, 9, 719, 9, 766, 7, 1030, 1, 1313, 3, 1451, 9, 1678, 9, 2152, 7, 2575, 7
(list; graph; listen)
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OFFSET
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0,4
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EXAMPLE
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The numbers 11, 13, 17, 19, 113, 1117, 11113, 11117, 11119, 111119, ... are primes.
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CROSSREFS
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Sequence in context: A038870 A140435 A063754 this_sequence A077202 A086665 A050521
Adjacent sequences: A099746 A099747 A099748 this_sequence A099750 A099751 A099752
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KEYWORD
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base,nonn
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AUTHOR
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Pierre CAMI (pierrecami(AT)tele2.fr), Nov 10 2004
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EXTENSIONS
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Edited by Don Reble (djr(AT)nk.ca), Nov 07 2005
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