Erdős-primes: Difference between revisions
julia example
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Optionally, show the '''number''' of Erdős-primes.
=={{header|Julia}}==
<lang julia>using Primes
let
p = primesmask(500)
println("Erdős primes under 500:")
pcount = 0
for i in 2:499
if p[i] && p[sum(digits(i))]
pcount += 1
print(lpad(i, 4), pcount % 20 == 0 ? "\n" : "")
end
end
println("\n\n$pcount Erdős primes found.")
end
</lang>{{out}}
<pre>
Erdős primes under 500:
2 3 5 7 11 23 29 41 43 47 61 67 83 89 101 113 131 137 139 151
157 173 179 191 193 197 199 223 227 229 241 263 269 281 283 311 313 317 331 337
353 359 373 379 397 401 409 421 443 449 461 463 467 487
54 Erdős primes found.
</pre>
=={{header|REXX}}==
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