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 A119382 Indices j of prime numbers p(j) such that (p(j-1) + p(j+2)) / p(j) = 2. 2
 12, 19, 59, 92, 112, 115, 140, 211, 233, 253, 261, 268, 276, 285, 291, 294, 301, 322, 352, 358, 369, 389, 407, 417, 473, 500, 542, 598, 612, 624, 714, 718, 723, 742, 819, 933, 939, 994, 998, 1016, 1098, 1119, 1263, 1299, 1312, 1400, 1414, 1418, 1422, 1449 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..3000 EXAMPLE a(1)=12 because the 11th prime 31 plus the 14th prime 43 divided by the 12th prime 37 equals 2. MATHEMATICA Select[Range[2, 1500], (Prime[ # - 1] + Prime[ # + 2])/(Prime[ # ]) == 2 &] - Stefan Steinerberger, Jul 26 2006 Module[{c}, Off[Part::partd]; c=Flatten[Position[Partition[Prime[ Range[ 1500]], 4, 1], _?((#[[1]]+#[[4]])/#[[2]]==2&)]]+1; On[Part::partd]; c] (* Harvey P. Dale, Jan 01 2013 *) CROSSREFS Sequence in context: A117539 A136770 A155574 * A166671 A104198 A093314 Adjacent sequences:  A119379 A119380 A119381 * A119383 A119384 A119385 KEYWORD nonn AUTHOR Axel Harvey, Jul 25 2006 EXTENSIONS More terms from Stefan Steinerberger, Jul 26 2006 STATUS approved

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Last modified June 17 23:56 EDT 2013. Contains 226327 sequences.