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 A117097 Numbers n such that nextprime(3*n)<3*nextprime(n) (if p is prime then nextprime(p)=p). 1
 1, 4, 6, 8, 9, 10, 12, 14, 15, 20, 21, 22, 24, 25, 26, 27, 32, 33, 34, 35, 36, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 60, 62, 63, 64, 65, 66, 68, 69, 70, 74, 75, 76, 77, 80, 84, 85, 86, 87, 90, 91, 92, 93, 94, 102, 104, 105, 110, 111, 112, 114, 115, 116, 117, 118 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Iain Fox, Table of n, a(n) for n = 1..10000 EXAMPLE nextprime(3*4)=13 and nextprime(3)*nextprime(4)=3*5=15 then 4 is member because 13<15 PROG (PARI) for(i=1, 150, if(nextprime(3*i)

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Last modified May 13 12:16 EDT 2021. Contains 343839 sequences. (Running on oeis4.)