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A156063
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Odd composite numbers whose reversal is a different composite.
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0
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15, 21, 25, 27, 39, 45, 49, 51, 57, 63, 65, 69, 75, 81, 85, 87, 93, 105, 115, 117, 123, 129, 135, 143, 147, 153, 155, 159, 165, 169, 177, 183, 185, 187, 189, 195, 201, 203, 205, 207, 209, 213, 215, 217, 219, 221, 225, 231, 235, 237, 243, 245, 247, 249, 253, 255
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OFFSET
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1,1
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LINKS
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EXAMPLE
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If odd composite 15 < 51 = composite, then 15=a(1). If odd composite 21 > 12 = composite, then 21=a(2). If odd composite 25 < 52 = composite, then 25=a(3), etc.
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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EXTENSIONS
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Added missing numbers in the 201-299 range. R. J. Mathar, Feb 13 2009
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STATUS
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approved
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