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For n congruent to 0 mod 20, a(n) is shown as zero to indicate that n is not an alternator.
45th International Mathematical Olympiad (45th IMO), Problem #6 and Solution, Mathematics Magazine, 2005, Vol. 78, No. 3, pp. 247, 250-251.
45th International Mathematical Olympiad (45th IMO), <a href="http://www.jstor.org/stable/30044168">Problem #6 and Solution</a>, Mathematics Magazine, 2005, Vol. 78, No. 3, pp. 247, 250-251.
For n congruent to 0 mod 20, a(n) is shown as zero to indicate that n is not an alternator.
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Walter Nissen, <a href="http://upforthecount.com">Home Page</a> (listed in lieu of email address)
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_Walter Nissen _, Jul 18 2005
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Walter Nissen, <a href="http://upforthecount.com">Home Page</a> (listed in lieu of email address)
base,easy,nonn,new
Walter Nissen (wnissen(AT)tfn.net), Jul 18 2005
45th International Mathematical Olympiad (45th IMO), Problem #6 and Solution, Mathematics Magazine, 2005 , , Vol. 78, No. 3, pp. 247, 250-251.
base,easy,nonn,new
45th International Mathematical Olympiad (45th IMO), Problem #6 and Solution, Mathematics Magazine, 2005 June, V78#3p247&, Vol. 78, No. 3, pp. 247, 250-1251.
base,easy,nonn,new