A176923 Squares of A057148 taken as decimal numbers.

0, 1, 121, 10201, 12321, 1002001, 1234321, 100020001, 102030201, 121242121, 123454321, 10000200001, 10221412201, 12102420121, 12345654321, 1000002000001, 1002003002001, 1020304030201, 1022325232201, 1210024200121, 1212225222121, 1232346432321, 1234567654321, 100000020000001, 100220141022001

Offset

1,3

Comments

See comment in A057148.

Links

Table of n, a(n) for n=1..25.

Prog

(Python)
def A176923(n):
    if n == 1: return 0
    a = 1<<n.bit_length()-2
    s = bin(a|(n&a-1))[2:]
    return int(s+(s[::-1] if a&n else s[-2::-1]))**2 # Chai Wah Wu, Jun 10 2024

Crossrefs

Cf. A002779, A057148, A063009.

Sequence in context: A144766 A277946 A263610 * A058412 A231661 A006102

Adjacent sequences: A176920 A176921 A176922 * A176924 A176925 A176926

Keyword

base,easy,nonn

Author

Jeremy Gardiner, Apr 29 2010

Status

approved