Numbers that are not the sum of 23 nonnegative 5-th powers.
24, 25, 26, 27, 28, 29, 30, 31, 55, 56, 57, 58, 59, 60, 61, 62, 63, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 179, 180, 181, 182, 183, 184, 185
1
There are 297 terms in this sequence, ending with 7738, which means that all numbers greater than 7738 can be written as the sum of 23 nonnegative 5-th powers.
T. D. Noe, Plot of 297 terms
T. D. Noe, Table of 297 terms
Wikipedia, Waring’s problem
(Mma) nn = 7; lim = nn^5; t23 = Table[0, {lim}]; Do[num = i^5 + j^5 + k^5 + l^5 + m^5 + n^5 + o^5 + p^5 + q^5 + r^5 + s^5 + t^5 + u^5 + v^5 + w^5 + x^5 + y^5 + z^5 + a^5 + b^5 + c^5 + d^5 + e^5; If[0 < num <= lim, t23[[num]]++], {i, 0, nn}, {j, i, nn}, {k, j, nn}, {l, k, nn}, {m, l, nn}, {n, m, nn}, {o, n, nn}, {p, o, nn}, {q, p, nn}, {r, q, nn}, {s, r, nn}, {t, s, nn}, {u, t, nn}, {v, u, nn}, {w, v, nn}, {x, w, nn}, {y, x, nn}, {z, y, nn}, {a, z, nn}, {b, a, nn}, {c, b, nn}, {d, c, nn}, {e, d, nn}]; Flatten[Position[t23, 0]]
nonn,fini
T. D. Noe, Jul 04 2017