A088727 a(n) is the (n-1)st smallest number that is the sum of 2 distinct positive n-th powers.

5, 28, 97, 1025, 4160, 18571, 390626, 1953637, 9824674, 53022429, 2176782337, 13060702208, 78368947065, 471258726400, 2973697798081, 232630513987208, 1628413598172593, 11398896347634610, 79793365809239777, 559022701241487132, 4041442752425255185

Offset

2,1

Links

Table of n, a(n) for n=2..22.

Example

Sums of 2 distinct k-th powers:
k=2:   5,   10,   13,    17,    20,    25,     26, ...
k=3:   9,   28,   35,    65,    72,    91,    126, ...
k=4:  17,   82,   97,   257,   272,   337,    626, ...
k=5:  33,  244,  275,  1025,  1056,  1267,   3126, ...
k=6:  65,  730,  793,  4097,  4160,  4825,  15626, ...
k=7: 129, 2188, 2315, 16385, 16512, 18571,  78126, ...
k=8: 257, 6562, 6817, 65537, 65792, 72097, 390626, ...
[edited by Jon E. Schoenfield, Mar 07 2018]

Crossrefs

Cf. A004431, A024670, A088687. - Michel Marcus, Mar 07 2018

Sequence in context: A275709 A257093 A225261 * A027016 A034582 A124133

Adjacent sequences: A088724 A088725 A088726 * A088728 A088729 A088730

Keyword

nonn

Author

Cino Hilliard, Nov 23 2003

Extensions

Edited Name and more terms from Jon E. Schoenfield, Mar 04 2018

Status

approved