A386487 A386482(n) - n.

0, 0, 1, 2, -2, 3, 5, 2, -1, 4, -4, 9, 5, 2, 5, -1, -12, 7, 11, 8, 5, 2, -1, -13, 8, 1, 9, 6, 3, 8, -12, 25, 21, 18, 15, 12, 9, 6, 3, 0, -6, 3, -4, -31, 20, 14, 11, 8, 0, 13, 0, -35, 15, 12, 9, 6, -26, 35, 31, 28, 25, 22, 19, 16, 13, 10, 7, 4, 1, -15, 4, -3, -50, 18, 19, -29, 64, 60, 57, 54, 51, 48, 45, 42, 39, 36, 33, 30, 27, 24, 21

Offset

1,4

Links

N. J. A. Sloane, Table of n, a(n) for n = 1..10000

Prog

(Python)
from math import gcd
from itertools import count, islice
def A386487_gen(): # generator of terms
    m, mset, c = 2, {2}, 3
    yield from (0, 0)
    for j in count(3):
        for i in range(m-1, c-1, -1):
            if i not in mset and gcd(i, m)>1:
                yield i-j
                break
        else:
            for i in count(max(c, m+1)):
                if i not in mset and gcd(i, m)>1:
                    yield i-j
                    break
        m = i
        mset.add(i)
        while c in mset:
            mset.remove(c)
            c += 1
A386487_list = list(islice(A386487_gen(), 30)) # Chai Wah Wu, Sep 10 2025

Crossrefs

Cf. A386482.

Sequence in context: A329792 A058256 A140183 * A280408 A130725 A256015

Adjacent sequences: A386484 A386485 A386486 * A386488 A386489 A386490

Keyword

sign

Author

N. J. A. Sloane, Sep 01 2025

Status

approved