Search: a101153 -id:a101153
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1, 2, 3, 8, 9, 10, 15, 16, 17, 22, 23, 24, 29, 30, 31, 36, 37, 38, 43, 44, 45, 50, 51, 52, 57, 58, 59, 60, 64, 65, 66, 67, 71, 72, 73, 74, 78, 79, 80, 81, 85, 86, 87, 88, 92, 93, 94, 95, 99, 100, 101, 102, 106, 107, 108, 109, 114, 115, 116, 121, 122, 123, 128, 129, 130, 135, 136, 137, 142, 143, 144, 149, 150, 151, 156, 157, 158, 163
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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A103067
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Numbers n such that 7*10^n + 8*R_n + 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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+10
1
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1, 4, 18, 28, 55, 1728, 1876, 1884, 6841, 10782, 25366, 98446, 137250
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OFFSET
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1,2
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COMMENTS
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Also numbers n such that (71*10^n+1)/9 is prime.
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LINKS
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FORMULA
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MATHEMATICA
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Do[ If[ PrimeQ[(71*10^n + 1)/9], Print[n]], {n, 0, 10000}]
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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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