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 A117874 Primes for which the level is equal to 5 in A117563. 3
 17, 61, 131, 151, 271, 523, 541, 571, 751, 797, 971, 991, 997, 1291, 1321, 1361, 1741, 1901, 1913, 2011, 2179, 2297, 2341, 2441, 2447, 2551, 2791, 2851, 3301, 3511, 3761, 3803, 4051, 4391, 4397, 4423, 4441, 4561, 4651, 4703, 4759, 5101, 5471, 5483, 5521 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Remi Eismann, Table of n, a(n) for n=1..10000 EXAMPLE 19=17+17 mod(3)=17+17 mod(15), level=5 157=151+151 mod(29)=151+151 mod(145) level=5 2203=2179+2179 mod(431)=2179+2179 mod(2155), level=5 MATHEMATICA f[n_] := Block[{d, j = 2, p = Prime@n}, d = Prime[n + 1] - p; While[j < p && Mod[p, j] != d, j++ ]; If[j == p, 0, j]]; g[n_] := Block[{d, k = p = Prime@n}, d = Prime[n + 1] - p; While[k > 0 && Mod[p, k] != d, k-- ]; If[k == 0, 0, k]]; h[n_] := Block[{a = f@n, b = g@n}, If[a == 0, 0, b/a]]; Prime@Select[ Range@763, h@# == 5 &] (* Robert G. Wilson v *) CROSSREFS Cf. A117078. Sequence in context: A156912 A141853 A139906 * A039607 A142299 A211579 Adjacent sequences:  A117871 A117872 A117873 * A117875 A117876 A117877 KEYWORD nonn AUTHOR Rémi Eismann, May 02 2006 EXTENSIONS More terms from Robert G. Wilson v, May 06 2006 Edited by N. J. A. Sloane, May 14 2006 STATUS approved

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