A003392 Numbers that are the sum of 3 positive 9th powers.

3, 514, 1025, 1536, 19685, 20196, 20707, 39367, 39878, 59049, 262146, 262657, 263168, 281828, 282339, 301510, 524289, 524800, 543971, 786432, 1953127, 1953638, 1954149, 1972809, 1973320, 1992491, 2215270, 2215781, 2234952, 2477413, 3906251, 3906762, 3925933, 4168394, 5859375

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Example

From David A. Corneth, Aug 04 2020: (Start)
391407194198 is in the sequence as 391407194198 = 3^9 + 16^9 + 19^9.
2313193015070 is in the sequence as 2313193015070 = 7^9 + 20^9 + 23^9.
11440294750613 is in the sequence as 11440294750613 = 1^9 + 25^9 + 27^9. (End)

Maple

N:= 10^10: # For all terms <= N
B:= floor(N^(1/9)):
S:=select(t -> t <= N, {seq(seq(seq(i^9+j^9+k^9, k=j..B), j=i..B), i=1..B)}):
sort(convert(S, list)); # Robert Israel, Mar 04 2020

Crossrefs

Cf. A001017 (ninth powers).

Sequence in context: A255017 A160362 A155852 * A133026 A100339 A195626

Adjacent sequences: A003389 A003390 A003391 * A003393 A003394 A003395

Keyword

nonn,easy

Author

N. J. A. Sloane

Status

approved