A350084 - OEIS

A350084

a(n) = ord(2,A006935(n)/2), where ord(k,m) is the multiplicative order of k modulo m.

1, 261, 165, 275, 13425, 1485, 1305, 32085, 825, 3465, 2093, 3135, 495, 495, 261, 847, 9405, 552189, 198561, 261, 579261, 2475, 6237, 166725, 111111, 3393, 3565, 25245, 18585, 4437, 891891, 309455, 37125, 4833, 2301585, 14355, 11781, 3315, 915, 84975, 35259

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OFFSET

1,2

COMMENTS

List of ord(2,k) where k ranges over the odd numbers such that 2^(2*k-1) == 1 (mod k).

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..1319

FORMULA

a(n) = ord(2,A347906(n)) = (A006935(n) - 1) / A350083(n).

EXAMPLE

A006935(2) = 161038, so a(2) = ord(2,161038/2) = 261.

A006935(3) = 215326, so a(3) = ord(2,215326/2) = 165.