

A007232


Number of free subsets of multiplicative group of GF(5^n).
(Formerly M2077)


1



2, 15, 74, 409, 1951, 9765, 48827, 256347, 1220699, 6103515, 30517572, 160216158, 762939452, 3814697265, 19073486293, 101327896117, 476837158134
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OFFSET

1,1


COMMENTS

Observe that a(4*n+2) = (5^(4*n+3)  5)/8 for n = 0,1,2,3. Does this result hold for general n?  Peter Bala, Mar 22 2018


REFERENCES

P. Bouchard and Y.N. Yeh, Finding ffree subsets of maximal cardinality, Séries Formelles et Combinatoire Algébrique, 4th colloquium, 1519 Juin 1992, Montréal, Université du Québec à Montréal, pp. 1117.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

Table of n, a(n) for n=1..17.


CROSSREFS

Cf. A007233.
Sequence in context: A125903 A268644 A178321 * A099743 A283842 A102289
Adjacent sequences: A007229 A007230 A007231 * A007233 A007234 A007235


KEYWORD

nonn


AUTHOR

Simon Plouffe


STATUS

approved



