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A003398 Numbers that are the sum of 9 positive 9th powers. 32
9, 520, 1031, 1542, 2053, 2564, 3075, 3586, 4097, 4608, 19691, 20202, 20713, 21224, 21735, 22246, 22757, 23268, 23779, 39373, 39884, 40395, 40906, 41417, 41928, 42439, 42950, 59055, 59566, 60077, 60588, 61099, 61610, 62121, 78737, 79248, 79759, 80270, 80781, 81292, 98419 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

David A. Corneth, Table of n, a(n) for n = 1..10000

EXAMPLE

From David A. Corneth, Aug 02 2020: (Start)

26015282 is in the sequence as 26015282 = 1^9 + 1^9 + 1^9 + 2^9 + 5^9 + 5^9 + 5^9 + 6^9 + 6^9.

56248367 is in the sequence as 56248367 = 2^9 + 5^9 + 5^9 + 5^9 + 6^9 + 6^9 + 6^9 + 6^9 + 6^9.

84613980 is in the sequence as 84613980 = 1^9 + 1^9 + 1^9 + 1^9 + 2^9 + 5^9 + 5^9 + 7^9 + 7^9. (End)

MATHEMATICA

M = 395235037; m = M^(1/9) // Ceiling; Reap[

For[b = a, b <= m, b++, For[c = b, c <= m, c++, For[d = c, d <= m, d++,

For[e = d, e <= m, e++, For[f = e, f <= m, f++, For[g = f, g <= m, g++,

For[h = g, h <= m, h++, For[i = h, i <= m, i++,

s = a^9 + b^9 + c^9 + d^9 + e^9 + f^9 + g^9 + h^9 + i^9;

If[s <= M, Sow[s]]]]]]]]]]]][[2, 1]] // Union (* Jean-Fran├žois Alcover, Dec 01 2020 *)

CROSSREFS

Cf. A001017 (9th powers).

Column k=9 of A336725.

Sequence in context: A102909 A230671 A281443 * A015508 A281800 A266889

Adjacent sequences:  A003395 A003396 A003397 * A003399 A003400 A003401

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified August 19 07:13 EDT 2022. Contains 356216 sequences. (Running on oeis4.)