Number of numbers k in interval [(p_n)^2+1, (p_n)^4] for which lpf(k-1)>lpf(k-3)>=p_n, such that {k-3, k-1} is not a pair of twin primes, where p_n=prime(n) and lpf = A020639.
A243804
Number of numbers k in interval [(p_n)^2+1, (p_n)^4] for which lpf(k-1)>lpf(k-3)>=p_n, such that {k-3, k-1} is not a pair of twin primes, where p_n=prime(n) and lpf = A020639.
Terms
- a(0) =36a(1) =84a(2) =382a(3) =593a(4) =1526a(5) =2070a(6) =4023a(7) =9536a(8) =11535a(9) =22050a(10) =31552a(11) =36034a(12) =49032a(13) =76464a(14) =113887a(15) =125138a(16) =176940a(17) =216419a(18) =233932a(19) =313011a(20) =371787a(21) =480984a(22) =666608a(23) =767403a(24) =811022a(25) =925567a(26) =974900a(27) =1104796a(28) =1749737a(29) =1948447
External references
- oeis: A243804