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A139223
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M*(M-1), where M is Mersenne prime A000668(n).
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5
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6, 42, 930, 16002, 67084290, 17179475970, 274876334082, 4611686011984936962, 5316911983139663484697699213480296450, 383123885216472214589586754930667236976614368197214210
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| O. E. Pol, Determinacion geometrica de los numeros primos y perfectos".
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FORMULA
| a(n)=A000668(n)*(A000668(n)-1).
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CROSSREFS
| Cf. A000668, A036689, A139115, A139116, A139224, A139225, A139226, A139256.
Sequence in context: A098461 A034662 A074651 * A185222 A179861 A083940
Adjacent sequences: A139220 A139221 A139222 * A139224 A139225 A139226
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KEYWORD
| nonn
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AUTHOR
| Omar E. Pol (info(AT)polprimos.com), May 10 2008
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 24 2009
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