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 A101874 Number of Abelian groups of order 4n+3. 0
 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 7, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 2, 1, 1, 3, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,7 LINKS Table of n, a(n) for n=0..104. MATHEMATICA a[n_] := FiniteAbelianGroupCount[4*n + 3]; Array[a, 100, 0] (* Amiram Eldar, Sep 23 2023 *) CROSSREFS Bisection of A101871. Cf. A101873, A101876. Sequence in context: A031245 A031244 A030576 * A318449 A336651 A066715 Adjacent sequences: A101871 A101872 A101873 * A101875 A101876 A101877 KEYWORD nonn,easy,changed AUTHOR N. J. A. Sloane, Jan 28 2005 EXTENSIONS More terms from Joshua Zucker, May 10 2006 STATUS approved

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Last modified September 27 14:11 EDT 2023. Contains 365711 sequences. (Running on oeis4.)