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A138816
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Concatenation of initial digit of n-th Mersenne prime A000668(n), initial digit of n-th even superperfect number A061652(n) and initial digit of n-th perfect number A000396(n).
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6
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326, 742, 314, 168, 843, 168, 521, 212, 212, 631, 181, 181, 632, 521, 155
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refs;
listen;
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internal format)
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OFFSET
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1,1
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COMMENTS
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Also, concatenation of initial digit of n-th Mersenne prime A000668(n), initial digit of n-th superperfect number A019279(n) and initial digit of n-th perfect number A000396(n), if there are no odd superperfect numbers.
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LINKS
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CROSSREFS
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KEYWORD
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base,nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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