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A037225 phi(2n+1). 9
1, 2, 4, 6, 6, 10, 12, 8, 16, 18, 12, 22, 20, 18, 28, 30, 20, 24, 36, 24, 40, 42, 24, 46, 42, 32, 52, 40, 36, 58, 60, 36, 48, 66, 44, 70, 72, 40, 60, 78, 54, 82, 64, 56, 88, 72, 60, 72, 96, 60, 100, 102, 48, 106, 108, 72 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

REFERENCES

V. I. Levenshtein, Conflict-avoiding codes and cyclic triple systems [in Russian], Problemy Peredachi Informatsii, 43 (No. 3, 2007), 39-53.

LINKS

T. D. Noe, Table of n, a(n) for n=0..10000

CROSSREFS

Sequence in context: A061228 A070229 A053568 * A060685 A073353 A066820

Adjacent sequences:  A037222 A037223 A037224 * A037226 A037227 A037228

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 05:45 EST 2012. Contains 205694 sequences.