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A103607
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Write down the semiprimes but omit any semiprime (such as 46 or 69) that has appeared as a string earlier in the sequence.
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0
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4, 6, 9, 10, 14, 15, 21, 22, 25, 26, 33, 34, 35, 38, 39, 49, 51, 55, 57, 58, 62, 65, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 106, 111, 115, 118, 119, 121, 122, 123, 129, 133, 134, 141, 142, 143, 145, 146, 155, 158, 159, 161, 166, 169, 177, 178, 183, 185, 187
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| The complement of this sequence is the sequence of semiprimes which are concatenations of successive semiprimes.
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EXAMPLE
| 46 is not in this sequence because concatenate(A001358(1),A001358(2)) = 46 = 2 * 23.
69 is not in this sequence because concatenate(A001358(2),A001358(3)) = 69 = 3 * 23.
469 is not in this sequence because concatenate(A001358(1),A001358(2),A001358(3)) = 469 = 7 * 67.
1415 is not in this sequence because concatenate(A001358(5),A001358(6)) = 1415 = 5 * 283.
2122 is not in this sequence because concatenate(A001358(7),A001358(8)) = 2122 = 2 * 1061.
3839 is not in this sequence because concatenate(A001358(14),A001358(15)) = 3839 = 11 * 349.
469101415 is not in this sequence because concatenate(A001358(1),A001358(2),A001358(3),A001358(4)),A001358(5),A001358(6)) = 469101415 = 5 * 93820283.
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CROSSREFS
| Cf. A001358, A048991, A119615.
Sequence in context: A108764 A193801 A129336 * A108574 A157931 A046368
Adjacent sequences: A103604 A103605 A103606 * A103608 A103609 A103610
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KEYWORD
| base,easy,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Jun 07 2006
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