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A073614
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Numbers n such that n*(prime(n)+1) is a square.
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0
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150, 1274, 7776, 37631, 96625, 1436778, 1617173, 8751645, 11873964, 78580934, 391317723, 403263375, 429830078, 1653987950, 1989687200, 2125840598, 2546468442, 8179002128, 8179002164, 8179002192, 30860615042, 31374585176
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OFFSET
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1,1
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COMMENTS
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a(23) > pi(10^12). [From Donovan Johnson, Feb 26 2010]
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LINKS
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Table of n, a(n) for n=1..22.
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MAPLE
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for i from 1 to 250000 do `if`(issqr(i*(ithprime(i)+1))=true, i, NULL); od;
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CROSSREFS
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Sequence in context: A140671 A054558 A211554 * A191547 A184673 A184665
Adjacent sequences: A073611 A073612 A073613 * A073615 A073616 A073617
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre, Aug 29 2002
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EXTENSIONS
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The next term, if it exists, is >250000.
More terms from Francois Jooste (pin(AT)myway.com), Mar 16 2003
a(6)-a(22) from Donovan Johnson, Feb 26 2010
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STATUS
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approved
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