OFFSET
1,3
COMMENTS
Replace "4" with "x" and extend the definition of a to positive rationals and a becomes an isomorphism between positive rationals under multiplication and polynomials over Z under addition. This remark generalizes A001222, A048675 and A054841: evaluate said polynomial at x=1, x=2 and x=10, respectively.
REFERENCES
Joseph J. Rotman, The Theory of Groups: An Introduction, 2nd ed. Boston: Allyn and Bacon, Inc. 1973. Page 9, problem 1.26.
LINKS
Sam Alexander, Post to sci.math.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Sam Alexander, Dec 12 2003
EXTENSIONS
More terms from Ray Chandler, Dec 20 2003
STATUS
approved