login
A258614
Numbers m having with the largest square <= m a common divisor > 1.
3
4, 6, 8, 9, 12, 15, 16, 18, 20, 22, 24, 25, 30, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 56, 63, 64, 66, 68, 70, 72, 74, 76, 78, 80, 81, 84, 87, 90, 93, 96, 99, 100, 102, 104, 105, 106, 108, 110, 112, 114, 115, 116, 118, 120, 121, 132, 143, 144, 146, 147
OFFSET
1,1
LINKS
FORMULA
A074695(a(n)) > 1.
EXAMPLE
a(11) = 24: GCD(24,A048760(24)) = GCD(24,16) = 4 > 1;
a(12) = 25: GCD(25,A048760(25)) = GCD(25,25) = 25 > 1;
but GCD(26,A048760(26)) = GCD(26,25) = 1, therefore 26 isn't a term.
PROG
(Haskell)
a258614 n = a258614_list !! (n-1)
a258614_list = filter ((> 1) . a074695) [1..]
(PARI) isok(m) = gcd(m, sqr(sqrtint(m))) > 1; \\ Michel Marcus, Jan 23 2022
CROSSREFS
Cf. A074695, A048760, A258613 (complement).
Sequence in context: A161576 A327446 A100425 * A269131 A130074 A304242
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jun 05 2015
STATUS
approved