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Search: id:A063784
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| A063784 |
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Primes obtained as a sum of cube of divisors of an integer. |
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+0
2
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| 73, 757, 1772893, 48551233240513, 378890487846991, 3156404483062657, 17390284913300671, 280343912759041771, 319913861581383373, 487014306953858713, 7824668707707203971, 8443914727229480773
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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Harry J. Smith, Table of n, a(n) for n=1,...,1000
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FORMULA
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Primes of form p = DivisorSigma[3, x].
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EXAMPLE
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sigma[3,9]=1+27+729=757, a prime.
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PROGRAM
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(PARI) { n=0; p=0; for (m=1, 10^9, p=nextprime(p+1); if(isprime(q=p^6 + p^3 + 1), write("b063784.txt", n++, " ", q); if (n==1000, break)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Aug 31 2009]
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CROSSREFS
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A023194.
Sequence in context: A167187 A133753 A137835 this_sequence A066101 A100412 A104907
Adjacent sequences: A063781 A063782 A063783 this_sequence A063785 A063786 A063787
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Aug 17 2001
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