OFFSET
1,1
COMMENTS
A055231(n) is the powerfree part of n. This sequence is infinite because all numbers of the form n = 9p, where p is a prime > 3, are in the sequence : A055231(9p) = p and A055231(9p - p) = A055231(8p) = p. The positive numbers of A055792 are also in the sequence because A055792(n) are squares and A055792(n)-1 are also squares.
EXAMPLE
MAPLE
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Feb 17 2012
STATUS
approved