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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 (list; graph; refs; listen; history; text; internal format)
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. Adams-Watters, 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. Adams-Watters, Apr 11 2011

More terms from Lars Blomberg, Nov 06 2015

STATUS

approved

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Last modified July 17 01:41 EDT 2018. Contains 312693 sequences. (Running on oeis4.)