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A115698 Semiprimes (A001358) whose digit reversal is the product of 2 palindromes greater than 1. +0
1
4, 6, 9, 21, 22, 33, 46, 51, 55, 65, 77, 82, 94, 121, 202, 203, 253, 262, 303, 393, 407, 427, 445, 446, 451, 485, 505, 559, 583, 626, 667, 669, 671, 687, 707, 789, 803, 849, 869, 889, 939, 1042, 1111, 1441, 1622, 1661, 1991, 2031, 2123, 2157, 2173, 2321 (list; graph; listen)
OFFSET

1,1

EXAMPLE

669=3*223 is semiprime and 966=6*161.

CROSSREFS

Cf. A001358, A115683.

Sequence in context: A056016 A098485 A120712 this_sequence A039566 A032817 A115681

Adjacent sequences: A115695 A115696 A115697 this_sequence A115699 A115700 A115701

KEYWORD

nonn,base

AUTHOR

Giovanni Resta (g.resta(AT)iit.cnr.it), Jan 31 2006

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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