A327756 Odd composite integers n such that binomial(n-1,(n-1)/2) is coprime to n.

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

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