The Madelung constant of rock salt

Find a closed form for the Madelung constant of rock salt, M ≈ 1.7475645946, the alternating lattice sum of unit charges on Z^3.

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File it in the catalog (shoal-catalog 0521c19bbd38)

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	1	+{
	2	+ "domain": "physics-astronomy",
	3	+ "topics": [
	4	+ "mathematical-physics",
	5	+ "materials-science",
	6	+ "number-theory"
	7	+ ],
	8	+ "type": "construction",
	9	+ "source": {
	10	+ "key": "horizonmath",
	11	+ "name": "HorizonMath",
	12	+ "url": "https://github.com/ewang26/HorizonMath/blob/4ef0b61a8a6d4c5ded661fab7c2e896af84abe6e/data/problems_full.json#L748-L758",
	13	+ "id": "madelung_nacl",
	14	+ "curator": "Erik Y. Wang, Sumeet R. Motwani et al.",
	15	+ "status": "open",
	16	+ "as_of": "2026-10-20",
	17	+ "catalog": "0521c19bbd38"
	18	+ }
	19	+}