login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A003392
Numbers that are the sum of 3 positive 9th powers.
31
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
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
KEYWORD
nonn,easy
STATUS
approved