A169851 EKG sequence started at 10 instead of 2.

10, 2, 4, 6, 3, 9, 12, 8, 14, 7, 21, 15, 5, 20, 16, 18, 22, 11, 33, 24, 26, 13, 39, 27, 30, 25, 35, 28, 32, 34, 17, 51, 36, 38, 19, 57, 42, 40, 44, 46, 23, 69, 45, 48, 50, 52, 54, 56, 49, 63, 60, 55, 65, 70, 58, 29, 87, 66, 62, 31, 93, 72, 64, 68, 74, 37, 111, 75, 78, 76, 80, 82, 41

Offset

1,1

Comments

A generalization of A064413.

Links

Peter Kagey, Table of n, a(n) for n = 1..10000

Prog

(Python)
from math import gcd
def aupton(terms):
    alst, aset = [1, 10], {1, 10}
    for n in range(2, terms+1):
        k = 2
        while True:
            while k in aset: k += 1
            if gcd(alst[-1], k) != 1: alst.append(k); aset.add(k); break
            k += 1
    return alst[1:]
print(aupton(73)) # Michael S. Branicky, Oct 02 2021

Crossrefs

For other initial terms, see A064413, A169837, A169839, A169841, A169843, A169845, A169847, A169849, A169853, A169855.

Cf. A169852.

Sequence in context: A371113 A049296 A220468 * A161995 A069036 A155817

Adjacent sequences: A169848 A169849 A169850 * A169852 A169853 A169854

Keyword

nonn

Author

T. D. Noe and N. J. A. Sloane, Jun 02 2010

Status

approved