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

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Examples

			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)
		

Links

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

Crossrefs

Cf. A001017 (ninth powers).

Programs

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