A081930 Triangle read by rows in which row n gives n smallest palindromic numbers of n digits each.

0, 11, 22, 101, 111, 121, 1001, 1111, 1221, 1331, 10001, 10101, 10201, 10301, 10401, 100001, 101101, 102201, 103301, 104401, 105501, 1000001, 1001001, 1002001, 1003001, 1004001, 1005001, 1006001, 10000001, 10011001, 10022001, 10033001, 10044001, 10055001, 10066001, 10077001

Offset

1,2

Links

Table of n, a(n) for n=1..36.

Prog

(Python)
def A081930(n, k):
    s = str(10**((n-1)//2)-(n==1)+k-1)
    return int(s+s[-1-n%2::-1]) # Pontus von Brömssen, Aug 24 2024

Crossrefs

Cf. A081931, A081932.

Sequence in context: A225361 A111696 A047902 * A143964 A034708 A091784

Adjacent sequences: A081927 A081928 A081929 * A081931 A081932 A081933

Keyword

base,nonn,tabl

Author

Amarnath Murthy, Apr 01 2003

Extensions

Corrected and extended by Joshua Zucker, Feb 13 2006

Status

approved