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Search: id:A105808
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| A105808 |
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Slowest increasing and self-describing sequence: first 2 digits are prime digits, followed by 3 composite digits, then 4 prime digits, then 6 composite digits, then 8 prime, then 2 composite, then 2 prime, etc. |
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+0
1
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| 2, 3, 4, 6, 8, 22, 23, 44, 46, 48, 52, 53, 55, 57, 64, 72, 84, 222, 444, 452, 524, 644, 722, 723, 844, 852, 2222, 2244, 4442, 5444, 6422, 7444, 8422, 22444, 44222, 52224, 64444
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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No 0's or 1's are allowed in the sequence. "Prime digits" are 2 3 5 7 and "composite" are 4 6 8 9.
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EXAMPLE
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2 3 4 6 8 22 23 44 46 48 52 53 55 57 64 72 ...
^ ^ - - - ^^ ^^ -- -- -- ^^ ^^ ^^ ^^ -- ^^
.2....3.....4.......6.........8.......2..2
pri..comp..pri.....comp......pri....com..pri
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CROSSREFS
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Sequence in context: A008324 A084074 A144722 this_sequence A124058 A118080 A136561
Adjacent sequences: A105805 A105806 A105807 this_sequence A105809 A105810 A105811
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KEYWORD
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base,easy,nonn
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AUTHOR
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Eric Angelini (eric.angelini(AT)kntv.be), May 05 2005
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