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Search: id:A138816
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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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+0
7
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| 326, 742, 314, 168, 843, 168, 521, 212, 212, 631, 181, 181
(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 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.
Also, concatenation of A135613(n), A138124(n) and A135617(n).
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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, A135613, A135167, A138124, A138817.
Sequence in context: A048918 A031516 A066128 this_sequence A138817 A158271 A097737
Adjacent sequences: A138813 A138814 A138815 this_sequence A138817 A138818 A138819
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KEYWORD
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base,more,nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 01 2008
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