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Search: id:A138820
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| A138820 |
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Concatenation of n-th even superperfect number, n-th Mersenne prime A000668(n) and n-th perfect number. |
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+0
3
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| 236, 4728, 1631496, 641278128, 4096819133550336, 655361310718589869056, 262144524287137438691328, 107374182421474836472305843008139952128, 115292150460684697623058430092136939512658455991569831744654692615953842176
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Concatenation of A061652(n), A000668(n) and A000396(n).
Also concatenation of n-th superperfect number, n-th Mersenne prime A000668(n) and n-th perfect number, if there are no odd superperfect numbers.
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CROSSREFS
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Cf. A000396, A000668, A019279, A061652, A138818, A138819.
Sequence in context: A146126 A138818 A138819 this_sequence A005391 A036270 A048454
Adjacent sequences: A138817 A138818 A138819 this_sequence A138821 A138822 A138823
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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 05 2008
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