The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A293646 Sum of two (possibly negative) coprime cubes, but not the sum of 2 non-coprime cubes. 4
 1, 2, 7, 9, 19, 26, 28, 35, 37, 61, 63, 65, 91, 98, 117, 124, 126, 127, 133, 169, 215, 217, 218, 271, 279, 316, 331, 335, 341, 342, 344, 351, 370, 386, 387, 397, 407, 468, 469, 485, 511, 539, 547, 559, 602, 604, 631, 637, 657, 665, 721, 730, 737, 793, 817, 819 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Not every term is cubefree; some are sb^3 where s is in A159843 and b > 1. LINKS Rosalie Fay, Table of n, a(n) for n = 1..101 (corrected by Ray Chandler, Jan 19 2019) EXAMPLE 344 = 7^3 + 1^3 and 344 is not also the sum of cubes of 2 non-coprime integers, so 344 is in the sequence. 152 = 6^3 + (-4)^3 and 6 and -4 are not coprime, so 152 is not in the sequence. CROSSREFS Cf. A020895 (cubefree); A293645 (allows non-coprime); A293648, A293651 Sequence in context: A177737 A336770 A293645 * A020895 A174247 A321322 Adjacent sequences:  A293643 A293644 A293645 * A293647 A293648 A293649 KEYWORD nonn AUTHOR Rosalie Fay, Oct 16 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 21 07:14 EDT 2021. Contains 343146 sequences. (Running on oeis4.)