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 A068192 Let a(1)=2, f(n) = 4*a(1)*a(2)*...*a(n-1) for n >= 1 and a(n) = f(n)-prevprime(f(n)-1) for n >= 2, where prevprime(x) is the largest prime < x. 4
 2, 3, 5, 7, 11, 13, 17, 19, 31, 29, 23, 41, 43, 37, 89, 59, 53, 67, 79, 71, 137, 109, 239, 167, 199, 47, 83, 97, 61, 373, 101, 179, 193, 131, 151, 73, 263, 593, 139, 113, 157, 103, 241, 181, 397, 233, 617, 311, 191, 229, 271, 269, 127, 223, 331, 337, 211, 163 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The terms are easily seen to be distinct. It is conjectured that every element is prime. Do all primes occur in the sequence? First 1000 terms are primes. - Mauro Fiorentini, Aug 01 2020 LINKS Mauro Fiorentini, Table of n, a(n) for n = 1..1000 MATHEMATICA <

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Last modified August 8 05:25 EDT 2020. Contains 336290 sequences. (Running on oeis4.)