A064370 revision #34
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A064370
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Zero, together with positive numbers k such that prime(k) - k is a square.
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8
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0, 1, 2, 12, 100, 118, 152, 190, 212, 258, 352, 462, 690, 741, 1285, 1396, 1417, 2119, 2318, 2603, 3370, 3777, 4073, 4155, 4485, 4522, 4600, 4719, 5317, 5446, 6697, 6748, 6985, 7144, 7595, 9492, 9551, 12010, 12985, 13438, 13850, 14672, 14739, 16510
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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Join[{0}, Select[Range[50000], IntegerQ[Sqrt[Prime[#] - #]] &]] (* Paolo Xausa, Apr 16 2024 *)
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PROG
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(PARI) j=[]; for(n=0, 20000, if(n==0 || issquare(prime(n)-n), j=concat(j, n))); j
(PARI) { n=0; default(primelimit, 20000000); for (m=0, 10^9, if (m==0 || issquare(prime(m) - m), write("b064370.txt", n++, " ", m); if (n==300, break)) ) } \\ Harry J. Smith, Sep 13 2009
(PARI)
upto(n) = {
my(t = 0, res = List(0));
forprime(p = 2, oo,
t++;
if(t > n, return(res));
if(issquare(p-t),
listput(res, t)
);
);
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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