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URL: https://oeis.org/history?seq=A004018

⇱ The On-Line Encyclopedia of Integer Sequences (OEIS)

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Theta series of square lattice (or number of ways of writing n as a sum of 2 squares). Often denoted by r(n) or r_2(n).
#280 by Michael De Vlieger at Sun Feb 15 23:26:59 EST 2026
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#279 by Stefano Spezia at Sun Feb 15 16:51:17 EST 2026
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#278 by Stefano Spezia at Sun Feb 15 16:29:00 EST 2026
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#277 by Sean A. Irvine at Sun Feb 15 13:03:06 EST 2026
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#276 by Stefano Spezia at Sun Feb 15 10:55:22 EST 2026
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#275 by Stefano Spezia at Sun Feb 15 09:56:30 EST 2026
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#274 by Stefano Spezia at Sun Feb 15 09:48:03 EST 2026
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#273 by Michael De Vlieger at Tue Feb 03 09:04:01 EST 2026
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#272 by Paolo Xausa at Tue Feb 03 04:41:08 EST 2026
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#271 by Paolo Xausa at Tue Feb 03 04:21:07 EST 2026
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