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Search: id:A100553
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| A100553 |
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Prime numbers (including 1) with a power of 2 digits, all digits from the set {1,2,3,5,7}, such that each half of the number is already in this sequence. |
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+0
1
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| 1, 2, 3, 5, 7, 11, 13, 17, 23, 31, 37, 53, 71, 73, 1117, 1123, 1153, 1171, 1373, 1723, 1753, 2311, 2371, 3137, 5323, 7331, 11172311, 11175323, 11231723, 11531123, 11711123, 11711753, 13737331, 17231171, 17532311, 23111723, 23711153
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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The sequence would be tragically short were the '1' not there.
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EXAMPLE
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11231723 is there because it is prime and 1123 and 1723 are there.
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CROSSREFS
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Sequence in context: A160337 A012884 A068669 this_sequence A152245 A007693 A103144
Adjacent sequences: A100550 A100551 A100552 this_sequence A100554 A100555 A100556
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KEYWORD
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nonn,base
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Nov 27 2004
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Noc 10 2005
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