A120850 Numbers n such that n is prime and is equal to the sum of the first k primes plus the product of the first k primes, for some k.
11, 227, 30071, 24647906487115793512432470614609487044327490547070674282967249490409801198254927547005559122946385681862066942903289, 62797802135946735863734268232365323600796854989079318289826397214991489160762431714712874321823048719463864215556568570809157897364620234601356930764612312239892910549558645813243759770009793795858849126389709
Offset: 1
Keywords
Examples
11=(2+3)+(2*3) and 11 is prime. 227= (2+3+5+7)+(2*3*5*7) and 227 is prime.
Programs
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Mathematica
tb = {};Do[pq = Plus @@ Prime[Range[1, k]] + Times @@ Prime[Range[1, k]]; If[PrimeQ[pq], AppendTo[tb, pq]], {k, 1, 200}]; tb
Comments