The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A005875 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A005875

Theta series of simple cubic lattice; also number of ways of writing a nonnegative integer n as a sum of 3 squares (zero being allowed).
(history; published version)

#193 by Charles R Greathouse IV at Sun Feb 16 08:32:29 EST 2025

LINKS

Eric Weisstein's World of Mathematics, <a href="httphttps://mathworld.wolfram.com/ThetaSeries.html">Theta Series</a>

Eric Weisstein's World of Mathematics, <a href="httphttps://mathworld.wolfram.com/RamanujanThetaFunctions.html">Ramanujan Theta Functions</a>

Discussion

Sun Feb 16

08:32

OEIS Server: https://oeis.org/edit/global/3014

#192 by Hugo Pfoertner at Sat Jun 22 01:39:44 EDT 2024

STATUS

reviewed

approved

#191 by Peter Luschny at Sat Jun 22 00:27:34 EDT 2024

STATUS

proposed

reviewed

#190 by Michel Marcus at Sat Jun 22 00:04:22 EDT 2024

STATUS

editing

proposed

#189 by Michel Marcus at Sat Jun 22 00:04:11 EDT 2024

LINKS

A. Martinez Torres, L. R. Dai, C. Koren, D. Jido, and E. Oset. , <a href="http://arxiv.org/abs/1109.0396">The KD, eta D_s interaction in finite volume and the D_{s^*0}(2317) resonance</a>, arXiv:1109.0396 [hep-lat], 2011.

STATUS

proposed

editing

#188 by Chai Wah Wu at Fri Jun 21 21:53:39 EDT 2024

STATUS

editing

proposed

#187 by Chai Wah Wu at Fri Jun 21 21:53:34 EDT 2024

PROG

(Python)

# uses Python code for A004018

from math import isqrt

def A005875(n): return A004018(n)+(sum(A004018(n-k**2) for k in range(1, isqrt(n)+1))<<1) # Chai Wah Wu, Jun 21 2024

STATUS

approved

editing

#186 by Amiram Eldar at Mon Dec 18 12:07:52 EST 2023

STATUS

reviewed

approved

#185 by Stefano Spezia at Mon Dec 18 12:02:50 EST 2023

STATUS

proposed

reviewed

#184 by Stefano Spezia at Mon Dec 18 12:02:45 EST 2023

STATUS

editing

proposed