A065042 Numbers k such that prime(k) + pi(k) is a prime.
1, 3, 8, 13, 15, 16, 20, 39, 45, 53, 62, 65, 71, 72, 80, 82, 90, 91, 92, 95, 113, 115, 117, 118, 119, 121, 143, 145, 147, 153, 156, 164, 166, 177, 181, 186, 189, 190, 195, 196, 202, 203, 224, 254, 255, 265, 268, 273, 294, 296, 319, 322, 323, 328, 329, 338, 343
Offset: 1
Keywords
Links
- Harry J. Smith, Table of n, a(n) for n = 1..1000
Programs
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Mathematica
Select[ Range[400], PrimeQ[ Prime[ # ] + PrimePi[ # ]] & ]
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PARI
{ n=0; for (m=1, 10^9, if (isprime(prime(m) + primepi(m)), write("b065042.txt", n++, " ", m); if (n==1000, return)) ) } \\ Harry J. Smith, Oct 04 2009