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Search: id:A061888
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| A061888 |
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Numbers n such that n^2 is the sum of the first k primes for some k. |
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4
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OFFSET
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1,1
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LINKS
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G. L. Honaker Jr. and C. Caldwell, Prime Curios!: 9
C. Riveras, PrimePuzzles.Net, Problem 9: Sum of first k primes is perfect square
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FORMULA
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a(n)^2 = A061890(n)
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EXAMPLE
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10^2 = 2+3+5+7+11+13+17+19+23, so 10 is in the sequence.
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CROSSREFS
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Cf. A033997, A033998, A061890.
Sequence in context: A115481 A154238 A024139 this_sequence A117803 A121787 A108089
Adjacent sequences: A061885 A061886 A061887 this_sequence A061889 A061890 A061891
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson (davidwwilson(AT)comcast.net), May 12, 2001
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EXTENSIONS
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468726713734 from Giovanni Resta (g.resta(AT)iit.cnr.it), May 27 2003
Edited by Ray Chandler (rayjchandler(AT)sbcglobal.net), Mar 20 2007
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