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Search: id:A138843
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| A138843 |
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Concatenation of initial and final digits of n-th perfect number. |
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+0
10
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| 66, 28, 46, 88, 36, 86, 18, 28, 26, 16, 18, 18, 26, 18, 58, 18, 96, 36, 16, 48, 16, 56, 36, 96, 16, 86, 36, 18, 18, 16, 28, 18, 86, 88, 36, 16, 86, 96, 46
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also, concatenation of A135617(n) and A094540(n).
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EXAMPLE
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a(5)=36 because the 5th perfect number A000396(5) is 33550336 and the concatenation of initial and final digits of 33550336 is 36.
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CROSSREFS
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Cf. A000396, A073729, A135617, A094540, A138840, A138841, A138842, A138844.
Adjacent sequences: A138840 A138841 A138842 this_sequence A138844 A138845 A138846
Sequence in context: A015039 A035519 A059755 this_sequence A033386 A008896 A071712
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KEYWORD
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base,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 02 2008
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