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Search: id:A086698
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| A086698 |
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Two-sided semiprimes: deleting any number of digits at left or at right, but not both, leaves a semiprime. |
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+0
1
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| 4, 6, 9, 46, 49, 69, 94, 469, 626, 694, 914, 934, 939, 949, 4694, 4934, 4939, 9134, 9346, 9586, 62386, 62614, 91346, 959939, 6998339, 91439939
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(18)=9134 is a term because 9134, 913,134,34,91,4,9 all are semiprimes.
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CROSSREFS
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Sequence in context: A107665 A085733 A107342 this_sequence A115666 A104389 A115655
Adjacent sequences: A086695 A086696 A086697 this_sequence A086699 A086700 A086701
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KEYWORD
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base,fini,full,nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jul 28 2003
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