This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A238198 Triangle of the discriminant of the polynomials x^n - x^m + 1, where 0 < m < n. 5
 -3, -23, -23, 229, 144, 229, 2869, 3017, 3017, 2869, -43531, -33856, -19683, -33856, -43531, -776887, -811043, -816631, -816631, -811043, -776887, 15953673, 13424896, 16692841, 5308416, 16692841, 13424896, 15953673, 370643273, 384126317, 239483061 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Boyd et al. mention these numbers. LINKS T. D. Noe, Rows n = 1..100 of triangle, flattened David W. Boyd, Greg Martin, and Mark Thom, Squarefree values of trinomial discriminants, arXiv 1402.5148 [math.NT], 2014. William Craig, Cubefree Trinomial Discriminants, arXiv:1901.03653 [math.NT], 2019. MATHEMATICA Flatten[Table[Discriminant[x^n - x^m + 1, x], {n, 2, 9}, {m, n - 1}]] CROSSREFS Cf. A238195 (discriminant of x^n - x^m - 1). Cf. A238196 (discriminant of x^n + x^m - 1). Cf. A238197 (discriminant of x^n + x^m + 1). Cf. A238199 (union). Sequence in context: A298885 A298657 A299609 * A178177 A124076 A153834 Adjacent sequences:  A238195 A238196 A238197 * A238199 A238200 A238201 KEYWORD sign,tabl AUTHOR T. D. Noe, Feb 24 2014 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 December 14 09:41 EST 2019. Contains 329979 sequences. (Running on oeis4.)