A115743 Squares that are the product of 2 palindromes greater than 1.

4, 9, 16, 25, 36, 49, 64, 81, 121, 484, 1089, 1764, 1936, 2401, 2704, 3025, 4356, 5929, 6084, 7744, 9801, 10201, 12321, 14641, 17161, 19881, 22801, 25921, 27225, 29241, 32761, 36481, 40804, 44944, 49284, 53824, 58564, 63504, 68644, 69696

Offset

1,1

Comments

Are most terms of the form p^2 where p is a palindrome? - David A. Corneth, May 25 2021

Links

David A. Corneth, Table of n, a(n) for n = 1..13971 (terms <= 10^15)

Example

6084 = 78^2 and 6084 = 9*676.

Mathematica

With[{nn=50000}, Select[Union[Select[Times@@@Tuples[Select[Range[2, nn], PalindromeQ], 2], IntegerQ[ Sqrt[ #]]&]], #<=2 nn&]] (* Harvey P. Dale, Aug 21 2022 *)

Crossrefs

Cf. A014186, A115683, A115744, A115745.

Sequence in context: A050749 A096599 A016073 * A014186 A052062 A052046

Adjacent sequences: A115740 A115741 A115742 * A115744 A115745 A115746

Keyword

nonn,base

Author

Giovanni Resta, Jan 31 2006

Status

approved