OFFSET
1,1
COMMENTS
LINKS
Wikipedia, Achilles number
EXAMPLE
5425069447 = 7^3 * 41^2 * 97^2 and 5425069448 = 2^3 * 26041^2. Since every prime factor of 5425069447 and 5425069448 is repeated, both numbers are Achilles numbers (A052486) and since the two numbers differ by 1, i.e., the value of A247246 at the index of 5425069447 in A052486 is 1, 5425069447 is a term of the sequence.
PROG
(PARI) is(n) = vecmin(factor(n)[, 2]) > 1 && vecmin(factor(n+1)[, 2]) > 1 && !ispower(n) && !ispower(n+1)
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Felix Fröhlich, May 12 2016
STATUS
approved