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 A200525 Zeisel numbers with p(0)=4. 0
 385, 2585, 7315, 8911, 27001, 39905, 48391, 87283, 192211, 196285, 319705, 410089, 425585, 441091, 624605, 679855, 1310185, 1899163, 2460439, 2586971, 2777041, 6654005, 7042411, 7501261, 8291459, 9516637, 10484585, 11141671, 12527281, 13015891, 13788319 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Pick any integers A and B and consider the linear recurrence relation given by p(0) = 4, p(i + 1) = A*p(i) + B. If for some n > 2, p(1), p(2), ..., p(n) are distinct primes, then the product of these primes is called a Zeisel number. LINKS Table of n, a(n) for n=1..31. Eric Weisstein's World of Mathematics, Zeisel Number. Wikipedia, Zeisel number EXAMPLE a=2, b=-3 => p(1) = (4*2)+(-3) = 5; p(2) = (5*2)+(-3) = (7); p(3) = (7*2)+(-3) = 11 => 5*7*11 = 385. a=2, b=5 => p(1) = (4*2)+5 = 13; p(2) = (13*2)+5 = 31; p(3) = (31*2)+5 = 67 => 13*31*67 = 27001. PROG (Rexx) n0=4 do m=1 to 53 a=2*m do b=(1-(4*a)) to 999 n1=(n0*a)+b n2=(n1*a)+b n3=(n2*a)+b z=n1*n2*n3 say n0 a b lineout("zeisel_4.txt", z||" = "||n1||"*"||n2||"*"||n3||" "||a||" "||b||" n0="||n0) end end CROSSREFS Cf. A051015. Sequence in context: A317272 A157354 A372319 * A225711 A351696 A204712 Adjacent sequences: A200522 A200523 A200524 * A200526 A200527 A200528 KEYWORD nonn AUTHOR Karsten Meyer, Nov 18 2011 STATUS approved

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Last modified September 16 17:53 EDT 2024. Contains 375976 sequences. (Running on oeis4.)