A318261 a(n) is the odd part of A318262(n).

3, 3, 7, 5, 3, 7, 15, 5, 3, 7, 15, 31, 9, 5, 21, 3, 7, 15, 31, 63, 9, 21, 3, 7, 15, 31, 63, 127, 17, 9, 5, 21, 85, 3, 51, 7, 15, 31, 63, 127, 255, 17, 9, 73, 5, 21, 85, 3, 51, 7, 15, 31, 63, 127, 255, 511, 33, 17, 73, 5, 21, 85, 341, 11, 93, 3, 51, 7, 15, 31

Offset

1,1

Comments

The odd part of n is the largest odd divisor of n (A000265).

Links

Peter Luschny, Table of n, a(n) for n = 1..1000

Prog

(Sage)
def A318261_list(len):
    count = 0; n = 0; L = []
    while count < len:
        n += 2
        m = power_mod(2, euler_phi(n), n)
        if m.is_power_of(2):
            v = 2^valuation(n, 2)
            L.append(n // v)
            count += 1
    return L
print(A318261_list(70))

Crossrefs

Cf. A000265, A318262.

Sequence in context: A324573 A096633 A175482 * A343996 A118362 A339020

Adjacent sequences: A318258 A318259 A318260 * A318262 A318263 A318264

Keyword

nonn

Author

Peter Luschny, Sep 05 2018

Status

approved