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A138817
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Concatenation of final digit of n-th Mersenne prime A000668(n), final digit of n-th even superperfect number A061652(n) and final digit of n-th perfect number A000396(n).
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8
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326, 748, 166, 748, 166, 166, 748, 748, 166, 166, 748, 748, 166, 748, 748, 748, 166, 166, 166, 748, 166, 166, 166, 166, 166, 166, 166, 748, 748, 166, 748, 748, 166, 748, 166, 166, 166, 166, 166
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OFFSET
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1,1
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COMMENTS
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Also, concatenation of final digit of n-th Mersenne prime A000668(n), final digit of n-th superperfect number A019279(n) and final digit of n-th perfect number A000396(n), if there are no odd superperfect numbers.
a(1)=326. For n>1 a(n) is equal to 166 or 748, only.
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LINKS
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CROSSREFS
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KEYWORD
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base,nonn,less
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AUTHOR
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STATUS
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approved
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