A059745 Palindromic squares of sporadic type.

676, 69696, 94249, 698896, 5221225, 6948496, 522808225, 617323716, 942060249, 637832238736, 1086078706801, 1615108015161, 4051154511504, 5265533355625, 9420645460249, 123862676268321, 144678292876441, 165551171155561, 900075181570009, 4099923883299904, 94206450305460249

Offset: 1

Author

N. J. A. Sloane, Feb 21 2001

Keywords

• nonn
• base

References

• C. Ashbacher, More on palindromic squares, J. Rec. Math. 22, no. 2 (1990), 133-135. [A scan of the first page of this article is included with the last page of the Keith (1990) scan]
• J. K. R. Barnett, "Tables of Square Palindromes in Bases 2 and 10," Journal of Recreational Mathematics, 23:1, pp. 13-18, 1991.
• M. Keith, "Classification and Enumeration of Palindromic Squares," Journal of Recreational Mathematics, 22:2, pp. 124-132, 1990.
• R. Ondrejka, "A Palindrome (151) of Palindromic Squares," Journal of Recreational Mathematics, 20:1, pp. 68-71, 1988.

Links

• Patrick De Geest, Full List of the Sporadic Square Palindromes (SSP), part of Palindromic Squares website on WorldOfNumbers.
• M. Keith, Classification and enumeration of palindromic squares, J. Rec. Math., 22 (No. 2, 1990), 124-132. [Annotated scanned copy] (Has many more terms)
• William Rex Marshall, Table up to 10^40

Crossrefs

Cf. A059744, A016106, A028818, A060088.

Formula

a(n) = A059744(n)^2. - Hugo Pfoertner, Oct 03 2023

Extensions

More terms from WorldOfNumbers website, communicated by Hugo Pfoertner, Oct 03 2023