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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 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
| L. C. Noll, Mersenne Prime Digits and Names.
O. E. Pol, Determinacion geometrica de los numeros primos y perfectos.
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CROSSREFS
| Cf. A000396, A000668, A019279, A061652, A080172, A094540, A138125, A138817.
Sequence in context: A031516 A066128 A138816 * A158271 A203723 A097737
Adjacent sequences: A138814 A138815 A138816 * A138818 A138819 A138820
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KEYWORD
| base,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 01 2008
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