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A199325
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Primes with digits '0', '1' and '5' only.
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25
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5, 11, 101, 151, 1051, 1151, 1511, 5011, 5051, 5101, 5501, 10111, 10151, 10501, 11551, 15101, 15511, 15551, 50051, 50101, 50111, 50551, 51001, 51151, 51511, 51551, 55001, 55051, 55501, 55511, 100151, 100501, 100511, 101051, 101111, 101501, 110051, 110501, 115001, 115151, 150001, 150011, 150151, 150551
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OFFSET
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1,1
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LINKS
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MAPLE
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N:= 10000: # to get the first N terms
count:= 0:
allowed:= {0, 1, 5}:
nallowed:= nops(allowed):
subst:= seq(i=allowed[i+1], i=0..nallowed-1):
for d from 0 while count < N do
for x1 from 1 to nallowed-1 while count < N do
for t from 0 to nallowed^d-1 while count < N do
L:= subs(subst, convert(x1*nallowed^d+t, base, nallowed));
X:= add(L[i]*10^(i-1), i=1..d+1);
if isprime(X) then
count:= count+1;
A[count]:= X;
fi
od od od:
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MATHEMATICA
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Select[FromDigits/@Tuples[{0, 1, 5}, 6], PrimeQ] (* Harvey P. Dale, Jul 23 2021 *)
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PROG
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(PARI) L=[0, 1, 5]; for(d=1, 6, u=vector(d, i, 10^(d-i))~; forvec(v=vector(d, i, [1+(i==1 & !L[1]), #L]), ispseudoprime(t=vector(d, i, L[v[i]])*u)&print1(t", "))) /* see A199327 for a function a(n) */
(Magma) [p: p in PrimesUpTo(160000) | Set(Intseq(p)) subset [0, 1, 5]]; // Vincenzo Librandi, Apr 22 2014
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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