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 A199349 Primes having only the (decimal) digits 3, 4 and 9. 10
 3, 43, 349, 433, 439, 443, 449, 499, 3343, 3433, 3449, 3499, 3943, 4339, 4349, 4493, 4933, 4943, 4993, 4999, 9343, 9349, 9433, 9439, 9949, 33343, 33349, 33493, 34439, 34499, 34939, 34949, 39343, 39439, 39443, 39499, 43399, 43499, 43933, 43943, 44449, 44939, 49333, 49339, 49393, 49433, 49499, 49939, 49943, 49993 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A020461 and A020466 are subsequences. - Vincenzo Librandi, Jul 30 2015 LINKS Alois P. Heinz, Table of n, a(n) for n = 1..10000 MATHEMATICA Select[Prime[Range[2 10^4]], Complement[IntegerDigits[#], {3, 4, 9}]=={} &] (* Vincenzo Librandi, Jul 30 2015 *) PROG (PARI) a(n, list=0, L=[3, 4, 9], reqpal=0)={my(t); for(d=1, 1e9, u=vector(d, i, 10^(d-i))~; forvec(v=vector(d, i, [1+(i==1&!L[1]), #L]), isprime(t=vecextract(L, v)*u) || next; reqpal && !isprime(A004086(t)) && next; list && print1(t", "); n--||return(t)))} (MAGMA) [p: p in PrimesUpTo(2*10^5) | Set(Intseq(p)) subset [3, 4, 9]]; // Vincenzo Librandi, Jul 30 2015 CROSSREFS Cf. Primes that contain only the digits (3,4,k): A199340 (k=0), A199341 (k=1), A199342 (k=2), A199345 (k=5), A199346 (k=6), A199347 (k=7), A199348 (k=8). Cf. A020449 - A020472, A199325 - A199329. Sequence in context: A060559 A197778 A321970 * A197609 A199346 A199340 Adjacent sequences:  A199346 A199347 A199348 * A199350 A199351 A199352 KEYWORD nonn,base AUTHOR M. F. Hasler, Nov 05 2011 STATUS approved

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Last modified December 4 04:49 EST 2021. Contains 349469 sequences. (Running on oeis4.)