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A066737
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Composite numbers that are concatenations of primes.
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4
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22, 25, 27, 32, 33, 35, 52, 55, 57, 72, 75, 77, 112, 115, 117, 132, 133, 135, 172, 175, 177, 192, 195, 213, 217, 219, 222, 225, 231, 232, 235, 237, 243, 247, 252, 253, 255, 259, 261, 267, 272, 273, 275, 279, 289, 292, 295, 297, 312, 315, 319, 322, 323, 325
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| A066737 = A152242 \ A000040 = A152242 intersect A002808. [From M. F. Hasler (www.univ-ag.fr/~mhasler), Oct 16 2009]
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EXAMPLE
| 72 is the concatenation of primes 7 and 2. 132 is the concatenation of primes 13 and 2. 225 is the concatenation of 2, 2 and 5.
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PROG
| (PARI) for(n=1, 999, !isprime(n) & is_A152242(n) & print1(n", ")) [From M. F. Hasler (www.univ-ag.fr/~mhasler), Oct 16 2009]
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CROSSREFS
| Cf. A121609.
Sequence in context: A186780 A034304 A167459 * A121609 A092631 A061371
Adjacent sequences: A066734 A066735 A066736 * A066738 A066739 A066740
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KEYWORD
| base,easy,nonn
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AUTHOR
| Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Jan 15 2002
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EXTENSIONS
| More terms from Larry Reeves (larryr(AT)acm.org), Apr 03 2002
Missing terms added by M. F. Hasler (www.univ-ag.fr/~mhasler), Oct 16 2009
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