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Search: id:A139246
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| A139246 |
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Triangle read by rows: row n lists the proper divisors of n-th perfect number A000396(n). |
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+0
2
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| 1, 2, 3, 1, 2, 4, 7, 14, 1, 2, 4, 8, 16, 31, 62, 124, 248, 1, 2, 4, 8, 16, 32, 64, 127, 254, 508, 1016, 2032, 4064, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8191, 16382, 32764, 65528, 131056, 262112, 524224, 1048448, 2096896, 4193792, 8387584, 16775168, 1
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Rows n has A133033(n) terms.
The n-th row sum is the n-th perfect number A000396(n).
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LINKS
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O. E. Pol, Determinacion geometrica de los numeros primos y perfectos".
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EXAMPLE
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Triangle begins:
1, 2, 3
1, 2, 4, 7, 14
1, 2, 4, 8, 16, 31, 62, 124, 248
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CROSSREFS
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Cf. A000396, A018254, A018487, A133024, A133025, A133031, A133033, A135652, A135653, A135654, A135655, A139247.
Sequence in context: A029271 A035459 A048232 this_sequence A131227 A050981 A053452
Adjacent sequences: A139243 A139244 A139245 this_sequence A139247 A139248 A139249
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KEYWORD
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nonn,tabf
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), Apr 22 2008, corrected Apr 25 2008
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