A393026 Numbers that can be written as s_1^x_1 + s_2^x_2 + s_3^x_3, with 0 < s_1 < s_2 < s_3 and x_1 > x_2 > x_3 > 1, with the restriction that if s_1 = 1 then x_1 is the least possible.

18, 25, 26, 33, 34, 42, 44, 45, 49, 53, 58, 59, 60, 64, 66, 68, 69, 73, 74, 75, 77, 79, 81, 82, 84, 90, 92, 95, 97, 98, 101, 105, 107, 108, 109, 114, 116, 117, 118, 121, 123, 124, 127, 128, 129, 131, 132, 133, 138, 140, 142, 143, 144, 145, 146, 149, 153, 154, 155, 156, 158, 159, 160, 161

Offset

1,1

Links

Table of n, a(n) for n=1..64.

Alberto Zanoni, DE-numbers.

Example

18 = 1^4 + 2^3 + 3^2;
25 = 1^4 + 2^3 + 4^2;
26 = 1^5 + 2^4 + 3^2;
...

Crossrefs

Cf. A393024, A393025, A393027, A393028, A393029, A393030, A393031, A393032, A393033, A393034.

Sequence in context: A072422 A003300 A245022 * A362435 A248111 A109769

Adjacent sequences: A393023 A393024 A393025 * A393027 A393028 A393029

Keyword

nonn

Author

Alberto Zanoni, Jan 31 2026

Status

approved