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A138832
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Concatenation of n-th Mersenne prime A000668(n) and n-th perfect number.
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1
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36, 728, 31496, 1278128, 819133550336, 1310718589869056, 524287137438691328, 21474836472305843008139952128, 23058430092136939512658455991569831744654692615953842176
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| a(3)=31496 because A000668(3)=31 and A000396(3)=496.
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CROSSREFS
| Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138833.
Sequence in context: A004419 A185491 A054339 * A109405 A064541 A058001
Adjacent sequences: A138829 A138830 A138831 * A138833 A138834 A138835
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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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