

A046376


Palindromes with exactly 2 palindromic prime factors (counted with multiplicity), and no other prime factors.


5



4, 6, 9, 22, 33, 55, 77, 121, 202, 262, 303, 393, 505, 626, 707, 939, 1111, 1441, 1661, 1991, 3443, 3883, 7997, 10201, 13231, 15251, 18281, 19291, 20602, 22622, 22822, 24842, 26662, 28682, 30903, 31613, 33933, 35653, 37673, 38683, 39993, 60206, 60406, 60806
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OFFSET

1,1


COMMENTS

Intersection of A002113 and A046368; subsequence of A188650; A188649(a(n))=a(n). [Reinhard Zumkeller, Apr 11 2011]
Equivalently, semiprime palindromes where both prime factors are palindromes.  Franklin T. AdamsWatters, Apr 11 2011


LINKS

Lars Blomberg, Table of n, a(n) for n = 1..1000


EXAMPLE

The palindrome 35653 is a term since it has 2 factors 101 353, both palindromic.


CROSSREFS

Cf. A046328, A046408, A001358.
Sequence in context: A084994 A046328 A196104 * A229129 A272436 A246569
Adjacent sequences: A046373 A046374 A046375 * A046377 A046378 A046379


KEYWORD

nonn,base


AUTHOR

Patrick De Geest, Jun 15 1998


EXTENSIONS

Definition clarified by Franklin T. AdamsWatters, Apr 11 2011
More terms from Lars Blomberg, Nov 06 2015


STATUS

approved



