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A139246
Triangle read by rows: row n lists the proper divisors of n-th perfect number A000396(n).
1
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
OFFSET
1,2
COMMENTS
Rows n has A133033(n) terms.
The n-th row sum is the n-th perfect number A000396(n).
EXAMPLE
Triangle begins:
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
...
MATHEMATICA
Table[Most[Divisors[PerfectNumber[n]]], {n, 6}]//Flatten (* Harvey P. Dale, Jul 08 2024 *)
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Apr 22 2008, corrected Apr 25 2008
STATUS
approved