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A275657
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The prime digits in the sequence appear in blocks and the successive sizes of these blocks are given by the sequence itself.
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0
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1, 2, 4, 3, 5, 6, 7, 22, 20, 8, 9, 10, 11, 12, 23, 13, 25, 27, 14, 15, 32, 33, 21, 16, 17, 35, 37, 52, 18, 19, 40, 41, 42, 53, 55, 57, 72, 73, 75, 77, 222, 223, 24, 43, 225, 227, 232, 233, 235, 237, 26, 44, 45, 252, 253, 28, 46, 47, 255, 257, 220, 48, 49, 60, 61, 62, 272, 273, 275, 63, 277, 322, 323, 29, 64, 65, 325, 327, 332, 221, 66
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OFFSET
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1,2
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COMMENTS
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The sequence is started with a(1)=1 and always extended with the smallest integer not yet present that does not lead to a contradiction.
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LINKS
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EXAMPLE
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The blocks of prime digits are indicated hereunder by parentheses; the successive block-sizes are 1, 2, 4, 3, 5, 6,... which reproduces the sequence itself:
1,(2),4,(3,5),6,(7,22,2)0,8,9,10,11,1(2,23),1(3,25,27),14,1(5,32,33,2)1,16,...
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CROSSREFS
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The equivalent sequence dealing with nonprime digits is A275659.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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