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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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1
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63, 287, 49631, 8128127, 335503368191, 8589869056131071, 137438691328524287, 230584300813995212821474883647, 26584559915698317446546926159538421762305843009213693951
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(3)=49631 because A000396(3)=496 and A000668(3)=31.
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CROSSREFS
| Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138832.
Sequence in context: A157948 A158684 A063398 * A204736 A160674 A034817
Adjacent sequences: A138830 A138831 A138832 * A138834 A138835 A138836
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KEYWORD
| base,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 06 2008
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