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A280297
Numbers n such that F(n) and F(n-1) are not squarefree where F(n) = A000045(n).
1
25, 91, 126, 175, 225, 276, 325, 426, 456, 475, 576, 625, 637, 703, 726, 775, 820, 876, 925, 979, 1001, 1002, 1026, 1075, 1176, 1183, 1225, 1275, 1326, 1375, 1431, 1476, 1525, 1548, 1625, 1626, 1675, 1729, 1776, 1825, 1926, 1975, 2076, 2094, 2125, 2148, 2226
OFFSET
1,1
COMMENTS
Utilized the factorization of Fibonacci numbers in the FactorDB.com database. - Robert Price, Feb 27 2017
EXAMPLE
25 is a term because Fibonacci(25) = 5^2 * 3001 and Fibonacci(24) = 2^5 * 3^2 * 7 * 23.
PROG
(PARI) is(n) = !issquarefree(fibonacci(n)) && !issquarefree(fibonacci(n-1));
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Altug Alkan, Dec 31 2016
EXTENSIONS
a(8)-a(108) from Robert Price, Feb 27 2017
STATUS
approved