A378916 a(n) is the smallest positive integer having n decompositions of twice its value into sums of two noncomposite numbers.
1, 2, 7, 12, 21, 24, 30, 70, 42, 45, 57, 60, 75, 84, 90, 117, 126, 156, 105, 135, 150, 189, 180, 165, 234, 288, 303, 195, 231, 240, 210, 285, 255, 396, 378, 438, 357, 444, 345, 360, 315, 330, 603, 390, 480, 435, 462, 450, 546, 609, 627, 420, 663, 540, 555, 615
Offset: 1
Keywords
Examples
For n = 3 we have that the first 3 in A001031 has index 7 and twice 7 is 14 and 14 has 3 decompositions into sums of two noncomposite numbers as follows: [1 + 13], [3 + 11], [7 + 7], so a(3) = 7.
Links
- David Consiglio, Jr., Table of n, a(n) for n = 1..200
- David Consiglio, Jr., Python
Extensions
More terms from David Consiglio, Jr., Dec 18 2024
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