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A138818
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Concatenation of initial digit of n-th even superperfect number A061652(n), initial digit of n-th Mersenne prime A000668(n) and initial digit of n-th perfect number A000396(n).
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5
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236, 472, 134, 618, 483, 618, 251, 122, 122, 361, 811, 811
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Also, concatenation of initial digit of n-th superperfect number A019279(n), initial digit of n-th Mersenne prime A000668(n) and initial digit of n-th perfect number A000396(n), if there are no odd superperfect numbers.
Also, concatenation of A138124(n), A135613(n) and A135617(n).
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LINKS
| L. C. Noll, Mersenne Prime Digits and Names".
J. M. Pedersen, Known Perfect Numbers.
O. E. Pol, Determinacion geometrica de los numeros primos y perfectos".
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CROSSREFS
| Cf. A000396, A000668, A019279, A061652, A135613, A135617, A138124, A138816, A138817, A138819, A138841, A138842, A138843.
Sequence in context: A129857 A146092 A146126 * A138819 A138820 A005391
Adjacent sequences: A138815 A138816 A138817 * A138819 A138820 A138821
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KEYWORD
| base,more,nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), Apr 05 2008
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