The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A355491 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A355491

Numbers of the form a+b+c = a^3 - b^3 - c^3 where a > b >= c > 0.
(history; published version)

#25 by N. J. A. Sloane at Tue Sep 06 15:16:50 EDT 2022

STATUS

proposed

approved

#24 by Jinyuan Wang at Tue Jul 05 04:55:47 EDT 2022

STATUS

editing

proposed

Discussion

Thu Jul 21

22:54

Kevin Ryde: Why does code have hard-coded 1000 three times?  If it's a limit then once surely?

22:57

Kevin Ryde: The limit is to be on the output terms?  Separate limits sometimes has danger of missing terms.

#23 by Jinyuan Wang at Tue Jul 05 03:05:24 EDT 2022

DATA

10, 35, 54, 64, 199, 235, 279, 747, 1224, 1610, 1774, 6156, 8254, 11035, 12024, 16875, 56439, 66340, 75635, 82279, 115712, 134045, 136765, 150480, 175616, 212266, 255277, 299789, 339759, 386704, 518410, 563814, 643824, 1025776, 1429190, 1431233, 1468846, 1598374

KEYWORD

nonn,more,changed

EXTENSIONS

a(12)-a(26) More terms from Jinyuan Wang, Jul 05 2022

STATUS

proposed

editing

#22 by Jinyuan Wang at Tue Jul 05 02:09:44 EDT 2022

STATUS

editing

proposed

#21 by Jinyuan Wang at Tue Jul 05 02:04:40 EDT 2022

EXTENSIONS

a(12)-a(26) from Jinyuan Wang, Jul 05 2022

Discussion

Tue Jul 05

02:09

Jinyuan Wang: I computed tp to the term 1431233, but my computer crashed...  )-:

#20 by Jinyuan Wang at Tue Jul 05 00:47:50 EDT 2022

DATA

10, 35, 54, 64, 199, 235, 279, 747, 1224, 1610, 1774, 6156, 8254, 11035, 12024, 16875, 56439, 66340, 75635, 82279, 115712, 134045, 136765, 150480, 175616, 212266

MATHEMATICA

Solve[a==r^3-s^3-d^3 && 1<=r<=1000 && 1<=s<=1000 && 1<=d<=1000 && 0<=a && r>s>=d && a==r+s+d, {a, r, s, d}, Integers]

1 <=d<=1000 && 0<=a && r>s>=d && a==r+s+d, {a, r, s, d}, Integers]

STATUS

proposed

editing

#19 by Mohammad Arab at Mon Jul 04 17:54:38 EDT 2022

STATUS

editing

proposed

Discussion

Mon Jul 04

19:21

Kevin Ryde: Same here about code variable names for consistency, and limit easier for the user to tinker with.

#18 by Mohammad Arab at Mon Jul 04 17:52:39 EDT 2022

NAME

Numbers k such that k = of the form a+b+c = a^3 - b^3 - c^3 where a, > b, >= c > 0 and a > b >= c.

STATUS

proposed

editing

#17 by Jon E. Schoenfield at Mon Jul 04 10:14:26 EDT 2022

STATUS

editing

proposed

Discussion

Mon Jul 04

17:06

Michel Marcus: please edit name as in A355490

#16 by Jon E. Schoenfield at Mon Jul 04 10:14:23 EDT 2022

NAME

Numbers k such that k = a+b+c = a^3 - b^3 - c^3 where a, b, c > 0 and a > b >= c.

EXAMPLE

10 is a term: 10 = 4+3+3 = 4^3 - 3^3 - 3^3.

35 is a term: 35 = 14+13+8 = 14^3 - 13^3 - 8^3.

STATUS

proposed

editing