A334354 The number of optimal sets of n distinct integers less than or equal to k with this property: the sum of every two members of this set divides the product of all the members of this set. An optimal set with this property is one whose greatest member is the least possible.

1, 1, 1, 1, 1, 1, 3, 1, 2, 6, 1, 2, 5, 4, 1, 1, 1, 196, 115, 34, 4, 674, 303, 86, 14, 1, 852, 164, 19, 1, 1, 176, 19, 1, 1, 44503, 11396

Offset

1,7

Links

Table of n, a(n) for n=1..37.

Zizheng Fang, Python program to generate A334354

Example

n=1:
1
n=2:
3, 6
3*6 = 18
3+6 divides 18
n=3:
3, 12, 15
3*12*15 = 540
3+12 divides 540
3+15 divides 540
12+15 divides 540
n=4:
2, 6, 10, 14
2*6*10*14 = 1680
2+6 divides 1680
2+10 divides 1680
2+14 divides 1680
6+10 divides 1680
6+14 divides 1680
10+14 divides 1680
n=5:
2, 6, 10, 14, 18
n=6:
2, 6, 10, 14, 18, 22
n=7:
2, 4, 10, 14, 18, 22, 26
2, 6, 10, 14, 18, 22, 26
4, 6, 10, 14, 18, 22, 26
n=8:
2, 4, 6, 10, 14, 18, 22, 26
n=9:
2, 6, 8, 10, 14, 18, 22, 26, 34
2, 6, 10, 14, 18, 22, 26, 30, 34

Crossrefs

Cf. A334352.

Sequence in context: A051277 A300908 A080818 * A052417 A130509 A171072

Adjacent sequences: A334351 A334352 A334353 * A334355 A334356 A334357

Keyword

nonn,more

Author

Zizheng Fang, Apr 24 2020

Status

approved