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 A129822 Array read by rows: each row lists three consecutive nonprime odd numbers {n-1,n+1,n+3}. 1
 91, 93, 95, 115, 117, 119, 117, 119, 121, 119, 121, 123, 121, 123, 125, 141, 143, 145, 143, 145, 147, 183, 185, 187, 185, 187, 189, 201, 203, 205, 203, 205, 207, 205, 207, 209, 213, 215, 217, 215, 217, 219, 217, 219, 221, 243, 245, 247, 245, 247, 249, 285 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Robert Israel, Table of n, a(n) for n = 1..10002 MAPLE a:=proc(n) if isprime(2*n-1)=false and isprime(2*n+1)=false and isprime(2*n+3)=false then 2*n-1, 2*n+1, 2*n+3 else fi end: seq(a(n), n=1..150); MATHEMATICA Flatten[Table[If[OddQ[n - 1] && PrimeQ[n - 1] == False && PrimeQ[n + 1] == False && PrimeQ[n + 3] == False, {{n - 1}, {n + 1}, {n + 3}}, {}], {n, 2, 300}]] CROSSREFS Cf. A099019 (second column), A161945 (first column). Sequence in context: A043811 A043820 A077685 * A321998 A020318 A126134 Adjacent sequences:  A129819 A129820 A129821 * A129823 A129824 A129825 KEYWORD nonn,tabf AUTHOR Roger L. Bagula, May 20 2007 EXTENSIONS Edited by N. J. A. Sloane, Jun 09 2007 STATUS approved

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Last modified January 19 21:47 EST 2020. Contains 331066 sequences. (Running on oeis4.)