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Search: id:A138841
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| A138841 |
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Concatenation of initial and final digits of n-th Mersenne prime A000668(n). |
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+0
9
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| 33, 77, 31, 17, 81, 11, 57, 27, 21, 61, 17, 17, 61, 57, 17, 17, 41, 21, 11, 27, 41, 31, 21, 41, 41, 41, 81, 57, 57, 51, 77, 17, 11, 47, 81, 61, 11, 41, 91
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(5)=81 because the 5th Mersenne prime is 8191, A000668(5)=8191.
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CROSSREFS
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Cf. A000668, A073729, A080172, A135613, A138840, A138842, A138843.
Sequence in context: A049012 A137187 A134037 this_sequence A138863 A138866 A001987
Adjacent sequences: A138838 A138839 A138840 this_sequence A138842 A138843 A138844
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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 01 2008
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