Smallest number m such that both m-1 and m+1 are products of at least n (not necessarily distinct) primes.
A384876
Smallest number m such that both m-1 and m+1 are products of at least n (not necessarily distinct) primes.
Terms
- a(0) =3a(1) =5a(2) =17a(3) =55a(4) =161a(5) =1457a(6) =2431a(7) =13121a(8) =101249a(9) =153089a(10) =2086399a(11) =7991297a(12) =65071999a(13) =72630271a(14) =2829746177a(15) =2975006719a(16) =68278476799a(17) =75389157377a(18) =159703334911
External references
- oeis: A384876