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A067315
Numbers k such that binomial(k, floor(k/2)) is not divisible by k.
4
4, 6, 8, 10, 14, 16, 18, 20, 22, 24, 26, 28, 32, 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 54, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 86, 88, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 134, 136, 138, 140
OFFSET
1,1
COMMENTS
All the terms are even. - Amiram Eldar, Aug 24 2024
LINKS
MATHEMATICA
Select[ Range[ 2, 150, 2 ], Mod[ Binomial[ #, #/2 ], # ]>0& ]
PROG
(PARI) is(k) = binomial(k, k\2) % k > 0; \\ Amiram Eldar, Aug 24 2024
CROSSREFS
Cf. A001405, A042970, A042996 (complement), A067348.
Sequence in context: A087270 A316262 A075124 * A069148 A328144 A327888
KEYWORD
nonn
AUTHOR
Labos Elemer, Jan 14 2002
STATUS
approved