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A046368
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Numbers with exactly 2 palindromic prime factors (counted with multiplicity), and no other prime factors.
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6
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4, 6, 9, 10, 14, 15, 21, 22, 25, 33, 35, 49, 55, 77, 121, 202, 262, 302, 303, 362, 382, 393, 453, 505, 543, 573, 626, 655, 706, 707, 746, 755, 766, 905, 917, 939, 955, 1057, 1059, 1111, 1119, 1149, 1267, 1337, 1441, 1454, 1514, 1565, 1574, 1594, 1661, 1765
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Intersection of A001358 and A033620; A046368 is a subsequence. [Reinhard Zumkeller, Apr 10 2011]
Equivalently, semiprimes where both prime factors are palindromes - Franklin T. Adams-Watters, Apr 11 2011.
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
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CROSSREFS
| Cf. A001358, A046400, A001358.
Sequence in context: A103607 A108574 A157931 * A113433 A115654 A036326
Adjacent sequences: A046365 A046366 A046367 * A046369 A046370 A046371
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 15 1998.
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EXTENSIONS
| Definition clarified by Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Apr 11 2011
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