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 A224470 Numbers n such that 7^n - n is prime. 4
 2, 6, 8, 12, 44, 48, 512, 1088, 1104, 6038 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS a(11) > 92000. - Giovanni Resta, Apr 08 2013 a(11) > 2*10^5. - Robert Price, Feb 11 2014 LINKS MAPLE A224470:=proc(q) local n; for n from 1 to q do if isprime(7^n-n) then print(n); fi; od; end: A224470(10^4); # Paolo P. Lava, Apr 18 2013 PROG (PARI) forstep(n=2, 10^4, 2, if(ispseudoprime(7^n-n), print1(n, ", "))); /* Joerg Arndt, Apr 07 2013 */ CROSSREFS Cf. A048744, A058037, A057908, A058046, A058829, A224468. Sequence in context: A065392 A030457 A296300 * A168247 A229056 A186703 Adjacent sequences:  A224467 A224468 A224469 * A224471 A224472 A224473 KEYWORD nonn,more AUTHOR Alex Ratushnyak, Apr 06 2013 STATUS approved

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Last modified September 20 03:28 EDT 2020. Contains 337264 sequences. (Running on oeis4.)