This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A240592 Number of primes between successive composite squarefree numbers (A120944). 1
 1, 2, 0, 2, 0, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 2, 0, 0, 1, 0, 2, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 2, 1, 0, 2, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0, 2, 0, 1, 0, 0, 1, 0, 1, 1, 0, 0, 2, 0, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS First positions where the numbers n=2..5 occur are at: 2, 142, 2180230, 256857823. - Vaclav Kotesovec, Apr 17 2014 LINKS EXAMPLE a(4) is 2 because A120944(4)=15, A120944(5)=21, 2 primes between them: 17 and 19. PROG (PARI) freesqrcomp(n)=issquarefree(n)&&!isprime(n) nextfqc(n)={local(k); k=n+1; while(!freesqrcomp(k), k+=1); return(k)} primesin(a, b)={local(p=a, q=0); while(p

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 18 15:00 EDT 2019. Contains 326106 sequences. (Running on oeis4.)