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A101873
Number of Abelian groups of order 4n+1.
1
1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 3, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 3, 1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 3, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 1
OFFSET
0,3
MATHEMATICA
a[n_] := FiniteAbelianGroupCount[4*n + 1]; Array[a, 100, 0] (* Amiram Eldar, Sep 23 2023 *)
CROSSREFS
Bisection of A101871.
Sequence in context: A332636 A353742 A238747 * A336691 A177991 A146289
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jan 28 2005
EXTENSIONS
More terms from Joshua Zucker, May 10 2006
STATUS
approved