A365272 a(n) is the least positive integer that can be expressed as the sum of two distinct prime powers (A000961) in exactly n ways.

1, 3, 5, 9, 12, 20, 30, 36, 48, 66, 72, 84, 90, 120, 144, 132, 150, 192, 180, 246, 264, 210, 252, 270, 294, 300, 330, 486, 360, 516, 522, 468, 390, 462, 420, 480, 540, 510, 570, 600, 714, 756, 936, 750, 690, 660, 630, 810, 780, 924, 870, 1296, 930, 1122, 1404, 840

Offset

0,2

Links

Table of n, a(n) for n=0..55.

Example

For n = 3: 9 = 1 + 8 = 2 + 7 = 4 + 5.

Crossrefs

Cf. A000961, A087747, A225099, A341132.

Sequence in context: A344715 A058599 A238662 * A059093 A084593 A275843

Adjacent sequences: A365269 A365270 A365271 * A365273 A365274 A365275

Keyword

nonn

Author

Ilya Gutkovskiy, Sep 07 2023

Status

approved