A071278 Sorted list of numbers b(i)*b(j), 2 < i < j, where b = A002113 = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 22, 33 ... is a list of the decimal palindromes.

6, 8, 10, 12, 12, 14, 15, 16, 18, 18, 20, 21, 22, 24, 24, 27, 28, 30, 32, 33, 35, 36, 40, 42, 44, 44, 45, 48, 54, 55, 56, 63, 66, 66, 66, 72, 77, 88, 88, 88, 99, 99, 110, 110, 132, 132, 132, 132, 154, 154, 165, 165, 176, 176, 176, 198, 198, 198, 198, 202, 220, 220, 222

Offset: 1

Author

Amarnath Murthy, Jun 07 2002

Keywords

• base
• nonn

Comments

Old name was: Palindromes which are nontrivial multiples of 2 distinct palindromes.

Repetitions are allowed. 12 appears twice because it is both 2*6 and 3*4.

Examples

			8 is in the sequence because 8=2*4.
		

Crossrefs

Cf. A002113.

Programs

Mathematica

Module[{nn=250,pals},pals=Select[Range[2,nn],PalindromeQ];Select[Sort[ Times@@#&/@ Subsets[pals,{2}]],#<=nn&]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, May 27 2018 *)

Extensions

Corrected and extended by Sascha Kurz, Jan 02 2003

Edited (with corrected definition) by N. J. A. Sloane, May 27 2018