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2, 5, 11, 41, 116, 197, 312, 435, 684, 1046, 1430, 1892, 2404, 3155, 3977, 9289, 17044, 26575, 38954, 54776, 73661, 96632, 119637, 218363, 361381, 512404, 1179475, 2374678, 3643657, 5111420, 7125412, 9493318, 13246266
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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The subsequence of primes in this sequence begin: 2, 5, 11, 41, 197, 218363, 3643657.
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LINKS
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FORMULA
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a(n) = sum[i=1..n] {i such that the Woodall number i*2^i - 1 is prime}.
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EXAMPLE
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a(6) = 2 + 3 + 6 + 30 + 75 + 81 = 197 is prime. a(33) = 2 + 3 + 6 + 30 + 75 + 81 + 115 + 123 + 249 + 362 + 384 + 462 + 512 + 751 + 822 + 5312 + 7755 + 9531 + 12379 + 15822 + 18885 + 22971 + 23005 + 98726 + 143018 + 151023 + 667071 + 1195203 + 1268979 + 1467763 + 2013992 + 2367906 + 3752948.
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CROSSREFS
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KEYWORD
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hard,nonn,less
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AUTHOR
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STATUS
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approved
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