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The only known powers of 2 with all digits even are 2 1 = 2, 2 2 = 4, 2 3 = 8, 2 6 = 64 and 2 11 = 2048. [12] The first 3 powers of 2 with all but last digit odd is 2 4 = 16, 2 5 = 32 and 2 9 = 512. The next such power of 2 of form 2 n should have n of at least 6 digits.
In 2003, according to one estimate, 1.4 million students took the SAT and 1.4 million also took the ACT test, [97] paying about $50 per test. [98] Generally counselors suggest that students should plan on taking the SAT or ACT test twice, so that a low score can possibly be improved. [100]