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Search: id:A061890
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| A061890 |
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Squares which are the sum of initial primes. |
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+0
4
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| 100, 25633969, 212372329, 292341604, 3672424151449, 219704732167875184222756
(list; graph; listen)
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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) = A061888(n)^2
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EXAMPLE
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100 = 10^2 = 2+3+5+7+11+13+17+19+23, so 100 is in the sequence.
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CROSSREFS
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Cf. A033997, A033998, A061888.
Sequence in context: A036507 A139110 A013855 this_sequence A126686 A164866 A164855
Adjacent sequences: A061887 A061888 A061889 this_sequence A061891 A061892 A061893
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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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Corrected by Vladeta Jovovic, May 21, 2001
219704732167875184222756 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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