A273970 Numbers x such that there exist a pair y, n with x < y, x != n and y != n that makes {x,y,n,n} an amicable multiset.

695520, 753480, 1113840, 1136520, 1784160, 2313360, 2898720, 3140280, 3865680, 3960600, 4272840, 4500720, 4626720, 6126120, 6167700, 7197960, 7442820, 7731360, 8177400, 8498700, 8784720, 8828820, 8920800, 8966160, 9124920, 9232860, 9664200, 9729720

Offset

1,1

Comments

We call the multiset {x,y,n,n} amicable iff sigma(x) = sigma(y) = sigma(n) = x+y+n+n. For the n values, see A273969. For the y values, see A273971.

If the condition x<y were dropped, the terms from A259306 would also belong here.

Links

John Cerkan, Table of n, a(n) for n = 1..8060

John Cerkan, Python code

Example

sigma(695520) = sigma(803040) = sigma(702240) = 695520 + 803040 + 702240 + 702240.

Crossrefs

Cf. A259302, A259303, A259304, A259305, A259306, A273969, A273971.

Sequence in context: A068745 A010084 A209735 * A345604 A346358 A206518

Adjacent sequences: A273967 A273968 A273969 * A273971 A273972 A273973

Keyword

nonn

Author

John Cerkan, Jul 17 2016

Status

approved