NumberADay
Tuesday, March 10, 2015

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Thank you for following MAA NumberADay. We will no longer be updating this blog.
Wednesday, December 24, 2014

2015

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2015 = 5 x 13 x 31. 2015 is palindromic in base 2 (binary): 11111011111 ( A030130  and A168355 ).  2015 repeats the string 133 in base 4:...
Tuesday, December 23, 2014

6884

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6884 = 2 x 2 x 1721. 6884 is the number of lines through at least two points of a 7 x 25 grid of points ( A160847 ). 6884 has a repres...
Monday, December 22, 2014

1853

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1853 = 17 x 109. 1853 is a semiprime divisible by the sum of its digits ( A118693 ). 1853 is the sum of two positive cubes and divisible...
Friday, December 19, 2014

6881

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6881 = 7 x 983. It is the product of two distinct primes ( A006881 ). 6881 is a composite number not ending in 0 that yields a prime when ...
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The Mathematical Association of America is the world's largest community of mathematicians, students, and enthusiasts. We accelerate the understanding of our world through mathematics, because mathematics drives society and shapes our lives. Visit us at maa.org.
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