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Search: id:A078765
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| A078765 |
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Prime numbers occurring at integer Pythagorean distance (radius) from 1 in Ulam square prime-spiral. Primes on axes are excluded. |
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+0
1
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OFFSET
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0,1
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COMMENT
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Note that prime numbers on an axis are automatically an integer distance from 1.
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EXAMPLE
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a(1) = 227, a prime number: distance from 1 off-axis = (6,8,10) triangle.
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CROSSREFS
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Sequence in context: A098247 A092994 A031513 this_sequence A142261 A117458 A142842
Adjacent sequences: A078762 A078763 A078764 this_sequence A078766 A078767 A078768
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KEYWORD
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nonn,more
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AUTHOR
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Donald S. McDonald (don.mcdonald(AT)paradise.net.nz), Jan 09 2003
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