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A172016
Numbers of the form 6*k-+1 such that 6*k-1=nonprime and 6*k+1=prime.
2
35, 37, 65, 67, 77, 79, 95, 97, 125, 127, 155, 157, 161, 163, 209, 211, 221, 223, 275, 277, 305, 307, 329, 331, 335, 337, 365, 367, 371, 373, 377, 379, 395, 397, 407, 409, 437, 439, 455, 457, 485, 487, 497, 499, 539, 541, 545, 547, 575, 577, 605, 607, 611
OFFSET
1,1
LINKS
MATHEMATICA
Select[#+{-1, 1}&/@(6Range[200]), CompositeQ[#[[1]]]&&PrimeQ[#[[2]]]&]// Flatten (* Harvey P. Dale, Nov 19 2019 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
Entries checked by R. J. Mathar, Apr 14 2010
STATUS
approved