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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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2
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OFFSET
| 1,2
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COMMENTS
| 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
| s=1; Do[s=s+k^k; If[PrimeQ[s], Print[{k, s}]], {k, 1, 500}]
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CROSSREFS
| Cf. A073825, A001923.
Sequence in context: A044239 A044620 A120534 * A176143 A205221 A044303
Adjacent sequences: A122163 A122164 A122165 * A122167 A122168 A122169
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KEYWORD
| nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Aug 23 2006
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