"simple" series not in OEIS yet?

Peter Pein petsie at dordos.net
Wed Jun 13 07:46:58 CEST 2007


Peter Pein schrieb:
> Dear seqfans,
> 
> when looking for the triangular numbers, which are differences of nonnegative
> cubes, I can't find them. Using Mathematica, I got
> 
...
> --> {0, 1, 91, 4095, 5886, 7875, 8128, 8911, 9045, 17955, 21736, 23653, 47278,
>  93961, 115921, 130816, 184528, 259560, 379756, 488566, 575128, 658378,
>  758296, 810901, 873181, 885115, 1060696, 1155960, 1358776, 1385280, 1997001,
>  2616328, 2685403}
> 
> 
> 
> Best regards,
> Peter
>  

The same holds for T(n) is a difference of squares (did not try superseeker yet):

{0, 1, 3, 15, 21, 28, 36, 45, 55, 91, 105, 120, 136, 153, 171, 231, 253, 276,
300, 325, 351, 435, 465, 496, 528, 561, 595, 703, 741, 780, 820, 861, 903,
1035, 1081, 1128, 1176, 1225, 1275, 1431, 1485, 1540, 1596, 1653, 1711, 1891,
1953}



Peter, i will add those 2 sequences - they will be A129965 and A129966

Neil





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