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 A117098 Numbers n such that nextprime(5*n)<5*nextprime(n) (if p is prime then nextprime(p)=p). 0
 1, 4, 6, 8, 9, 10, 12, 14, 15, 16, 20, 21, 22, 24, 25, 26, 27, 30, 32, 33, 34, 35, 36, 38, 39, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 62, 63, 64, 65, 66, 68, 69, 70, 74, 75, 76, 77, 80, 81, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 98, 99, 100 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS denote f(x)=nextprime(x) let A(p)={n/f(p*n)f(p)*f(n)} I conjectured that when p --> infinity, A(p) = All composite positive integers when p --> infinity, B(p) = All primes numbers LINKS EXAMPLE nextprime(5*4)=23 and nextprime(5)*nextprime(4)=5*5=25 then 4 is member because 23<15 PROG (PARI) for(i=1, 100, if(nextprime(5*i)

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Last modified January 27 16:41 EST 2022. Contains 350611 sequences. (Running on oeis4.)