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A296505
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The least number m not less than the n-th prime p such that m^2 - p is prime.
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0
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2, 4, 6, 12, 18, 18, 18, 24, 26, 40, 42, 48, 42, 60, 52, 56, 60, 90, 102, 72, 78, 84, 90, 90, 114, 102, 114, 112, 126, 122, 138, 132, 140, 156, 154, 192, 174, 174, 168, 174, 196, 192, 212, 234, 206, 216, 240, 246, 230, 264, 240, 264, 282, 260, 260, 272
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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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f:= proc(n) local p, m;
p:= ithprime(n);
for m from p+1 by 2 do if isprime(m^2-p) then return m fi od:
end proc:
f(1):=2:
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MATHEMATICA
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Table[m = p = Prime[n]; While[! PrimeQ[m^2 - p], m++]; m, {n, 60}] (* slightly modified by Robert G. Wilson v, Dec 14 2017 *)
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PROG
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(PARI) vector(100, n, m=prime(n); while(!isprime(m^2-prime(n)), m++); m)
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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