A373448 10^n-th binary palindrome.

0, 27, 2313, 249903, 24183069, 2258634081, 249410097687, 24350854001805, 2229543293296319, 248640535848971067, 24502928886295666773, 2255382216082613264687, 247524358984342778844555, 24637651997205933916917957, 2280497169597819727642768343, 246037303364254649637740936547

Offset: 0

Author

Chai Wah Wu, Jun 14 2024

Keywords

• nonn
• base

Comments

a(n) = A006995(10^n).

Links

• Chai Wah Wu, Table of n, a(n) for n = 0..500

Crossrefs

Cf. A002113, A006995, A083816, A099280.

Programs

PARI

a(n) = A006995(10^n); \\ using A006995 PARI program; Michel Marcus, Jun 16 2024

Python

def A373448(n):
    if n == 0: return 0
    k = 10**n
    a = 1<<(l:=k.bit_length()-2)
    m = a|(k&a-1)
    return (m<