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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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2
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63, 287, 49631, 8128127, 335503368191, 8589869056131071, 137438691328524287, 23058430081399521282147483647, 26584559915698317446546926159538421762305843009213693951, 191561942608236107294793378084303638130997321548169216618970019642690137449562111
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OFFSET
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1,1
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COMMENTS
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a(15) has 1156 digits. - Harvey P. Dale, Jan 10 2023
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LINKS
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Harvey P. Dale, Table of n, a(n) for n = 1..14
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EXAMPLE
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a(3)=49631 because A000396(3)=496 and A000668(3)=31.
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MATHEMATICA
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Module[{nn=10}, FromDigits[Flatten[IntegerDigits/@#]]&/@Thread[{PerfectNumber[ Range[ nn]], 2^ MersennePrimeExponent[ Range[nn]]-1}]] (* Harvey P. Dale, Jan 10 2023 *)
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CROSSREFS
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Cf. A000396, A000668, A138816, A138817, A138818, A138819, A138820, A138821, A138822, A138832.
Sequence in context: A158684 A063398 A359564 * A204736 A160674 A034817
Adjacent sequences: A138830 A138831 A138832 * 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, Apr 06 2008
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EXTENSIONS
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Corrected and extended by Harvey P. Dale, Jan 10 2023
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STATUS
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approved
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