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 A178899 Numbers which are both primes and problimes (third definition). 1
 2, 7, 11, 19, 23, 43, 53, 73, 79, 97, 103, 109, 127, 139, 151, 157, 163, 181, 193, 199, 211, 1873, 1999, 2017, 2053, 2089, 2143, 2161, 2179, 2251, 2269, 2287, 2341, 2377, 2467, 2503, 2521, 2539, 2557, 2593, 2647, 2683, 2719, 2791, 2917, 2953, 2971, 3061, 3079 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..1000 FORMULA A000040 INTERSECTION A003068. MAPLE b:= proc(n) option remember; local k;       if n=1 then c(2):= 1; 2              else k:= ceil (b(n-1) +1/mul((1-1/b(j)), j=1..n-1));                   c(k):= n; k       fi     end: a:= proc(n) option remember; local k;       if n=1 then b(1)              else for k from c(a(n-1))+1 while not isprime (b(k))                   do od; b(k)       fi     end: seq (a(n), n=1..50);  # Alois P. Heinz, Dec 29 2010 CROSSREFS Cf. A000040, A003068, A178532. Sequence in context: A166862 A105881 A060191 * A023393 A084619 A236478 Adjacent sequences:  A178896 A178897 A178898 * A178900 A178901 A178902 KEYWORD nonn AUTHOR Jonathan Vos Post, Dec 29 2010 EXTENSIONS More terms from Alois P. Heinz, Dec 29 2010 STATUS approved

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Last modified September 17 22:53 EDT 2019. Contains 327147 sequences. (Running on oeis4.)