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Search: id:A138728
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| A138728 |
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Array read by rows: row n lists n-th even superperfect number A061652(n), n-th Mersenne prime A000668(n) and n-th perfect number A000396(n). |
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1
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| 2, 3, 6, 4, 7, 28, 16, 31, 496, 64, 127, 8128, 4096, 8191, 33550336, 65536, 131071, 8589869056, 262144, 524287, 137438691328, 1073741824, 2147483647, 2305843008139952128, 1152921504606846976, 2305843009213693951
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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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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EXAMPLE
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Array begins:
2, 3, 6
4, 7, 28
16, 31, 496
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CROSSREFS
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Cf. A000396, A000668, A019279, A061652, A138818, A138819.
Sequence in context: A138608 A092283 A099900 this_sequence A082332 A154285 A036552
Adjacent sequences: A138725 A138726 A138727 this_sequence A138729 A138730 A138731
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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), Apr 07 2008
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