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A098818
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Smallest k such that k*Mersenne_prime(n)^2 -1 (or k*A000668(n)^2 -1) is prime.
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0
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2, 2, 8, 2, 12, 2, 2, 98, 38, 122, 126, 678, 440, 1040, 776, 1398, 2714, 3362, 650, 8910, 22010, 11172, 1422, 5274, 33944, 4508, 12614, 202298, 275466
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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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2*((2^2-1)^2)-1=17 prime so a(1)=2.
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CROSSREFS
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KEYWORD
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more,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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