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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Rows n has A133033(n) terms. The n-th row sum is the n-th perfect number A000396(n). LINKS EXAMPLE Triangle begins: 1, 2, 3 1, 2, 4, 7, 14 1, 2, 4, 8, 16, 31, 62, 124, 248 CROSSREFS Cf. A000396, A018254, A018487, A133024, A133025, A133031, A133033, A135652, A135653, A135654, A135655, A139247. Sequence in context: A081536 A297497 A152736 * A187247 A131227 A190257 Adjacent sequences:  A139243 A139244 A139245 * A139247 A139248 A139249 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Apr 22 2008, corrected Apr 25 2008 STATUS approved

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Last modified January 27 06:18 EST 2022. Contains 350601 sequences. (Running on oeis4.)