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 A192594 Monotonic ordering of set S generated by these rules: if x and y are in S and 5x+2y is a prime, then 5x+2y is in S, and 1 is in S. 2
 1, 7, 19, 37, 43, 73, 79, 97, 109, 151, 163, 181, 193, 199, 223, 229, 241, 271, 307, 313, 331, 337, 367, 373, 379, 397, 409, 421, 433, 439, 457, 463, 487, 499, 523, 541, 547, 571, 577, 601, 613, 619, 631, 643, 661, 673, 691, 709, 727, 739, 751, 757, 769 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See the discussions at A192476 and A192580. LINKS MATHEMATICA start = {1}; primes = Table[Prime[n], {n, 1, 1000}]; f[x_, y_] := If[MemberQ[primes, 5 x + 2 y], 5 x + 2 y] b[x_] := Block[{w = x}, Select[Union[ Flatten[AppendTo[w, Table[f[w[[i]], w[[j]]], {i, 1, Length[w]}, {j, 1, Length[w]}]]]], # < 2000 &]]; t = FixedPoint[b, start] (* A192594 *) PrimePi[t] (* A192595 *) CROSSREFS Cf. A192595, A192476, A192580. Sequence in context: A068678 A069833 A215421 * A352243 A031337 A241984 Adjacent sequences: A192591 A192592 A192593 * A192595 A192596 A192597 KEYWORD nonn AUTHOR Clark Kimberling, Jul 05 2011 STATUS approved

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Last modified December 1 05:02 EST 2022. Contains 358454 sequences. (Running on oeis4.)