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A055724
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Number of lucky twins <= 10^n.
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0
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1, 2, 7, 33, 178, 1162, 7669, 55548, 419174, 3274570, 26298112
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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a(7),a(8),a(9) were calculated by Walter Schneider (wschnei(AT)t-online.de).
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STATUS
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approved
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