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Search: id:A139223
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| 6, 42, 930, 16002, 67084290, 17179475970, 274876334082, 4611686011984936962, 5316911983139663484697699213480296450, 383123885216472214589586754930667236976614368197214210
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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O. E. Pol, Determinacion geometrica de los numeros primos y perfectos".
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FORMULA
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a(n)=A000668(n)*(A000668(n)-1).
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MAPLE
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read("transforms3") : Mp := BFILETOLIST("b000668.txt") : A139223 := proc(n) global Mp; op(n, Mp)*(op(n, Mp)-1) ; end; seq(A139223(n), n=1..14) ; [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 24 2009]
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CROSSREFS
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Cf. A000668, A036689, A139115, A139116, A139224, A139225, A139226, A139256.
Sequence in context: A098461 A034662 A074651 this_sequence A083940 A101071 A097298
Adjacent sequences: A139220 A139221 A139222 this_sequence A139224 A139225 A139226
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KEYWORD
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nonn
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 10 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 24 2009
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