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Search: id:A120492
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| A120492 |
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1 + Sum[ Prime[k]^(n-1), {k,1,n}]. |
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+0
5
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| 2, 6, 39, 504, 17765, 552552, 30870007, 1387350084, 103306557609, 16762578985600, 1290073179870299, 216632259853089564, 30312656885388018973, 2922170957243151047352, 378560698729260507690687
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Prime p divides a(p). n divides a(n) for n={1,2,3,4,5,6,7,9,10,11,12,13,17,19,22,23,29,31,37,41,43,45,47,...}.
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FORMULA
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a(n) = 1 + Sum[ Prime[k]^(n-1), {k,1,n}].
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MATHEMATICA
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Table[1+Sum[Prime[k]^(n-1), {k, 1, n}], {n, 1, 20}]
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CROSSREFS
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Sequence in context: A118324 A060421 A054970 this_sequence A028300 A068207 A027161
Adjacent sequences: A120489 A120490 A120491 this_sequence A120493 A120494 A120495
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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 04 2006
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