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A106554
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Concatenation of the two divisors of a semiprime, smallest divisor first.
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4
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22, 23, 33, 25, 27, 35, 37, 211, 55, 213, 311, 217, 57, 219, 313, 223, 77, 317, 511, 319, 22, 9, 231, 513, 323, 237, 711, 241, 517, 243, 329, 713, 331, 247, 519, 253, 337, 523, 259, 717, 1111, 261, 341, 343, 719, 267, 347, 271, 1113, 529, 273, 531, 279, 353, 723
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Concatenation of the divisors starting with the largest one leads to another sequence.
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EXAMPLE
| First semiprime is 4; 4 is 2*2 -> 22.
Second semiprime is 6; 6 is 2*3 -> 23.
Third semiprime is 9; 9 is 3*3 -> 33.
Fourth semiprime is 10; 10 is 2*5 -> 25.
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CROSSREFS
| Cf. A106550, A084126, A084127, A001358.
Sequence in context: A091404 A146755 A106556 * A118297 A022392 A041976
Adjacent sequences: A106551 A106552 A106553 * A106555 A106556 A106557
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KEYWORD
| base,easy,nonn
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AUTHOR
| Eric Angelini (eric.angelini(AT)kntv.be), May 09 2005
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EXTENSIONS
| More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 19 2005
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