A356209 a(n) is the position of the latest occurrence of n in A133388.

2, 8, 18, 32, 41, 72, 98, 128, 162, 181, 242, 288, 313, 392, 421, 512, 514, 648, 722, 761, 882, 968, 1058, 1152, 1201, 1301, 1458, 1568, 1466, 1741, 1922, 2048, 2178, 2056, 2381, 2592, 2594, 2888, 2817, 3121, 3202, 3528, 3698, 3872, 3789, 4232, 4418, 4608, 4802, 4804, 5101

Offset

1,1

Links

Table of n, a(n) for n=1..51.

Formula

a(k) = 2*k^2 for k not in A009003.

Prog

(Python)
from sympy.solvers.diophantine.diophantine import diop_DN
def A356209(n):
    for m in range(n**2<<1, 0, -1):
        if n==max((a for a, b in diop_DN(-1, m)), default=0):
            return m # Chai Wah Wu, Sep 08 2022

Crossrefs

Cf. A000161, A001481, A009003, A356208.

Sequence in context: A063581 A293296 A055044 * A357851 A067051 A074629

Adjacent sequences: A356206 A356207 A356208 * A356210 A356211 A356212

Keyword

nonn

Author

Hugo Pfoertner, Sep 07 2022

Status

approved