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A050688
Numbers k such that A000422(k) is nonsquarefree.
2
8, 9, 15, 17, 18, 26, 27, 35, 36, 44, 45, 53, 54, 56, 62, 63, 71, 72, 80, 81, 89, 90, 98, 99, 107, 108, 109
OFFSET
1,1
EXAMPLE
a(2)=9 because 987654321 = 3^2 * 17^2 * 379721.
CROSSREFS
KEYWORD
nonn,base,hard
AUTHOR
Patrick De Geest, Aug 15 1999
EXTENSIONS
Definition corrected by Charles R Greathouse IV, Sep 20 2012
a(17)-a(24) and name corrected by Sean A. Irvine, Aug 17 2021
a(25)-a(27) from Daniel Suteu, Aug 18 2021
STATUS
approved