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Search: id:A138817
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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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+0
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
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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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.
Also, concatenation of n-th term of A080172, A138125(n) and A094540(n).
a(1)=326. For n>1 a(n) is equal to 166 or 748, only.
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LINKS
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L. C. Noll, Mersenne Prime Digits and Names.
O. E. Pol, Determinacion geometrica de los numeros primos y perfectos.
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CROSSREFS
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Cf. A000396, A000668, A019279, A061652, A080172, A094540, A138125, A138817.
Sequence in context: A031516 A066128 A138816 this_sequence A158271 A097737 A126311
Adjacent sequences: A138814 A138815 A138816 this_sequence A138818 A138819 A138820
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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 01 2008
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