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Search: id:A122166
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| A122166 |
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Numbers n such that 1 + Sum k^k (k=1..n) is prime. |
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+0
2
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OFFSET
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1,2
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COMMENT
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Primes of the form A001923[n] = Sum k^k (k=1..n) are given in A073826[n] and their indices are given in A073825[n] = {2,5,6,10,30,...}.
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MATHEMATICA
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s=1; Do[s=s+k^k; If[PrimeQ[s], Print[{k, s}]], {k, 1, 500}]
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CROSSREFS
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Cf. A073825, A001923.
Sequence in context: A044239 A044620 A120534 this_sequence A044303 A044684 A044384
Adjacent sequences: A122163 A122164 A122165 this_sequence A122167 A122168 A122169
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KEYWORD
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nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 23 2006
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