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A089724 Numbers p satisfying the following conditions: p is a prime of form 10k+9 and the function f[p,7,10] applied to p is not greater than 5, where f[p,7,10]=10*fractionalpart[n/70]=1*.((n/70)-Floor[n/70]). 0

%I #7 Mar 30 2012 17:34:14

%S 19,29,79,89,149,229,239,359,379,439,449,499,509,569,659,709,719,859,

%T 919,929,1009,1069,1129,1279,1289,1409,1429,1489,1499,1549,1559,1619,

%U 1699,1709,1759,1979,2039,2129,2179,2269,2339,2389,2399,2459,2539,2549

%N Numbers p satisfying the following conditions: p is a prime of form 10k+9 and the function f[p,7,10] applied to p is not greater than 5, where f[p,7,10]=10*fractionalpart[n/70]=1*.((n/70)-Floor[n/70]).

%t f[x_, d_, m_] := Mod[x/d, m] or alternatively f[x_, d_, m_] := m*(x/(d*m)-Floor[x/(d*m)]); Do[If[PrimeQ[n]&&Equal[Mod[n, 10], 9]]&&!Greater[f[n, 7, 10], 5], Print[n]], {n, 1, 1000}]

%Y Cf. A034433.

%K nonn

%O 1,1

%A _Roger L. Bagula_, Jan 07 2004

%E Edited by Labos, E., Jan 24 2004

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Last modified April 24 19:24 EDT 2024. Contains 371962 sequences. (Running on oeis4.)