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Search: id:A138833
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| A138833 |
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Concatenation of n-th perfect number and n-th Mersenne prime A000668(n). |
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+0
2
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| 63, 287, 49631, 8128127, 335503368191, 8589869056131071, 137438691328524287, 230584300813995212821474883647, 26584559915698317446546926159538421762305843009213693951
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OFFSET
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1,1
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EXAMPLE
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a(3)=49631 because A000396(3)=496 and A000668(3)=31.
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CROSSREFS
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Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138832.
Sequence in context: A157948 A158684 A063398 this_sequence A034817 A038993 A068022
Adjacent sequences: A138830 A138831 A138832 this_sequence A138834 A138835 A138836
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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 06 2008
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