105

This number is a composite.

Just showing those entries submitted by 'Ramanujan': (Click here to show all)

105/π⁴ = (1 + 1/2⁴)(1 + 1/3⁴)(1 + 1/5⁴)(1 + 1/7⁴)(1 + 1/11⁴) … . [Ramanujan]