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A103071
Numbers n such that 8*10^n + R_n + 2 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
1
1, 10, 24, 199, 745, 7753, 17938, 21319, 24948, 26119, 29454, 51889, 62824, 88105
OFFSET
1,2
COMMENTS
Also numbers n such that (73*10^n+17)/9 is prime.
a(15) > 10^5. - Robert Price, Oct 16 2015
FORMULA
a(n) = A101058(n) + 1.
MATHEMATICA
Do[ If[ PrimeQ[(73*10^n + 17)/9], Print[n]], {n, 0, 10000}]
CROSSREFS
Sequence in context: A261807 A135285 A235940 * A264296 A265150 A057462
KEYWORD
more,nonn
AUTHOR
Robert G. Wilson v, Jan 19 2005
EXTENSIONS
a(7)-a(11) from Kamada data by Robert Price, Dec 14 2010
a(12)-a(14) from Robert Price, Oct 16 2015
STATUS
approved