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Talk:Sequences determined by prime signature
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Sequences determined by subset of prime signature
A004018 (r_2 or number of representations as sum of two squares) is determined by signature over two sets of primes (p%3=1 and p%3=2). I am unsure which category it belongs under (if it belongs at all). Seth A. Troisi (talk) 19:38, 2 July 2020 (EDT)