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A327756 Odd composite integers n such that binomial(n-1,(n-1)/2) is coprime to n. 1
9, 21, 25, 27, 49, 55, 57, 65, 75, 81, 115, 119, 121, 125, 133, 169, 171, 183, 203, 217, 219, 237, 243, 253, 265, 275, 289, 301, 305, 319, 329, 341, 343, 355, 361, 365, 377, 403, 481, 489, 505, 507, 515, 517, 529, 543, 549, 565, 583, 605, 625, 629, 657, 669, 689, 697, 707, 711, 721, 723, 729, 731, 737, 767, 779, 781, 791, 793 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Composite integer n is in this sequence if for every prime p|n, the base-p representation of (n-1)/2 is composed of digits not exceeding (p-1)/2.

LINKS

Table of n, a(n) for n=1..68.

CROSSREFS

Subsequence of A327755.

Sequence in context: A327685 A355535 A154384 * A210251 A143791 A091113

Adjacent sequences:  A327753 A327754 A327755 * A327757 A327758 A327759

KEYWORD

nonn

AUTHOR

Max Alekseyev, Sep 24 2019

STATUS

approved

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Last modified August 11 06:08 EDT 2022. Contains 356046 sequences. (Running on oeis4.)