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A122691
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a(n) is the least prime factor of (9 * 10^(6*n-4) - 11) / 7.
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1
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127, 401, 19, 53, 151, 7, 139, 127, 19, 78721, 3458771, 19, 7, 38954263, 19, 79, 53, 19, 157, 7, 19, 127, 18191, 19, 12119, 421, 7, 107434435760557861791327959267859939351202240879711219728393537522815146155523913, 79, 19, 23196834569628410341642097660316821
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OFFSET
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1,1
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LINKS
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EXAMPLE
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n=2, (9*10^8-11)/7 = 128571427 = 401 * 320627 hence a(2)=401.
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CROSSREFS
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KEYWORD
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nonn,changed
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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