Happy New Eban!
Marc LeBrun
mlb at fxpt.com
Mon Dec 26 22:16:07 CET 2005
Here's a traditional holiday sampling of factoids about 2006 gleaned from
the On-Line Encyclopedia of Integer Sequences:
Among other things, 2006 is the...
A022664 coefficient of x^14 in Product (1-n*x^n)^4.
A030015 9th element in the binomial transform of 1,2,3,5,7,11,13,17,19,23,....
A035939 number of partitions of 38 into parts not of the form 7k, 7k+3 or
7k-3.
(Also number of partitions with at most 2 parts of size 1 and
differences
between parts at distance 2 are greater than 1.)
A066967 total of the odd parts in all partitions of 16.
A078392 sum of the GCDs of each partition of 25.
A080149 number for which both 2006^2+1 and 2006^2+3 are prime.
(Hardy and Littlewood conjectured that the set of such twin
primes is infinite.)
A085945 number of subsets of {1,2,3,4,5,6,7,8,9,10,11} with relatively
prime elements.
A102628 number of partitions of 27 whose number of parts is relatively
prime to 27.
A006933 the 23rd "eban" number (names in English containing the letter "e"
are banned).
(The next "eban year" won't be until 2030.)
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