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A084441 Primes that can be written as 1+p+p^k, p prime and k>0. 5

%I

%S 5,7,11,13,19,23,31,47,59,67,83,107,131,167,179,227,263,307,347,359,

%T 383,467,479,503,563,587,631,719,733,839,863,887,983,1019,1187,1283,

%U 1307,1319,1367,1439,1487,1523,1619,1723,1823,1907,2027,2039,2063,2099,2207

%N Primes that can be written as 1+p+p^k, p prime and k>0.

%C A084440(a(n))>0; safe primes (A005385) are a subset.

%e prime(6) = 13 = 1+3+3^2, therefore 13 is a term; A084440(6)=1.

%Y Cf. A084442, A084443, A084444, A084445.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, May 26 2003

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Last modified September 24 03:26 EDT 2021. Contains 347623 sequences. (Running on oeis4.)