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A215015
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Number of sphenic twins up to 10^n.
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1
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OFFSET
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1,3
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COMMENTS
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The sphenic twin pairs {230, 231}, {285, 286}, ... are counted once at a time.
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LINKS
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Table of n, a(n) for n=1..7.
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CROSSREFS
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Cf. A007304, A215217, A066509, A215218, A215152.
Sequence in context: A086923 A206532 A106717 * A219072 A195505 A092609
Adjacent sequences: A215012 A215013 A215014 * A215016 A215017 A215018
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KEYWORD
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nonn
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AUTHOR
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Martin Renner, Aug 06 2012
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STATUS
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approved
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