43

This number is a prime.

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The (4*3)th lucky number. [Post]

43 is the fourth Centered Heptagonal (7-gonal) Number. Note that 4 + 3 = 7. [Post]

Although Barack H. Obama said in his Inauguration Address: "Forty-four Americans have now taken the presidential oath," the number is actually 43, as Stephen Grover Cleveland was both the twenty-second and twenty-fourth President of the United States. [Post]

The largest prime "p" root vector parameter of any of the 99 subgroups of E_8 found by Mathematica computation of M.K. Ahsan and T. Hubsch, namely the subgroup SO_14 X SU_2. [Post]

Largest known prime partial sum of number of positive knots with n crossings: 0 + 0 + 1 + 0 + 1 + 0 + 1 + 1 + 1 + 3 + 2 + 7 + 9 + 17 = 43. [Post]

Smallest prime partial sum of tricapped prism numbers. [Post]