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 A174874 Smaller prime number of two distinct primes a and b such that a*b+-d are primes, and d is a difference between a and b. 2
 5, 7, 13, 41, 61, 73, 139, 181, 193, 229, 241, 349, 389, 409, 433, 457, 463, 569, 577, 661, 673, 709, 769, 881, 1021, 1049, 1117, 1201, 1249, 1321, 1801, 1873, 2029, 2089, 2113, 2281, 2389, 2473, 2521, 2593, 2689, 2857, 3109, 3169, 3181, 3301, 3313, 3361 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 2*3=6;3-2=1;6-1=5, 2*5=10;5-2=3;10-3=7, 3*5=15;5-3=2;15-2=13,.. LINKS Table of n, a(n) for n=1..48. MATHEMATICA lst={}; Do[pa=Prime[a]; Do[pb=Prime[b]; sp=pa*pb; dp=Abs[pa-pb]; If[PrimeQ[sp-dp]&&PrimeQ[sp+dp], AppendTo[lst, sp-dp]], {b, a+1, 5!}], {a, 5!}]; Union@lst CROSSREFS Cf. A088708, A174873. Sequence in context: A063446 A339775 A064600 * A109904 A077781 A102872 Adjacent sequences: A174871 A174872 A174873 * A174875 A174876 A174877 KEYWORD nonn AUTHOR Vladimir Joseph Stephan Orlovsky, Mar 31 2010 STATUS approved

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Last modified March 4 11:02 EST 2024. Contains 370528 sequences. (Running on oeis4.)