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 A274610 Values of c such that p^2-c and p^2+c are both positive primes, for the special case when p^2-c = 3, or c = p^2-3, where p is a prime. 1
 1, 22, 118, 358, 1678, 3478, 5038, 6238, 10198, 17158, 19318, 22798, 32758, 36478, 52438, 58078, 72358, 109558, 143638, 177238, 212518, 229438, 248998, 259078, 326038, 410878, 434278, 502678, 737878, 863038, 982078, 1062958, 1100398, 1274638, 1442398, 1515358, 1559998, 1635838, 1907158, 2042038 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS All values of a(n), except {1, 22}, equal 118 mod 120. Corresponding values of p = sqrt(c+3)begin {2,5,11,19,41,59,71,79,101...}. This relates to a comment at A047222 regarding c values for the general case of p^2-c and p^2+c both being positive primes. LINKS Table of n, a(n) for n=1..40. MATHEMATICA result = {}; Do[c = Prime[i]^2 - 3; If[PrimeQ[Prime[i]^2 + c], AppendTo[result, {Prime[i], c}]], {i, 1, 1000}]; result PROG (PARI) lista(nn) = forprime(p=2, nn, if (isprime(2*p^2-3), print1(p^2-3, ", "))); \\ Michel Marcus, Jul 05 2016 CROSSREFS Sequence in context: A289350 A100930 A260810 * A290800 A251930 A039612 Adjacent sequences: A274607 A274608 A274609 * A274611 A274612 A274613 KEYWORD nonn AUTHOR Richard R. Forberg, Jun 30 2016 STATUS approved

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Last modified June 23 22:09 EDT 2024. Contains 373661 sequences. (Running on oeis4.)