OFFSET
1,1
COMMENTS
The sequence is infinite as it contains 29400*k + 49 for k >= 0. - David A. Corneth, Sep 12 2022
FORMULA
A008683(a(n)) = 0.
EXAMPLE
24 is divisible by 2 times 2, 25 by 5 times 5, and 24+25=49 divisible by 7 times 7. Next, 49 is divisible by 7 times 7, 50 is divisible by 5 times 5, the sum is 99 divisible by three times three.
MATHEMATICA
Select[2*Select[Range[5000], ! SquareFreeQ[#] && ! SquareFreeQ[# + 1] &] + 1, ! SquareFreeQ[#] &] (* Amiram Eldar, Sep 12 2022 *)
PROG
(PARI) is(n) = bitand(n, 1) && !issquarefree(n) && !issquarefree(n - n>>1) && !issquarefree(n >> 1) \\ David A. Corneth, Sep 12 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
Daniel Barker, Sep 12 2022
EXTENSIONS
More terms from Amiram Eldar, Sep 12 2022
STATUS
approved