Irregular triangle where row n lists primes q below the n-th primorial such that the multiplicative order of q mod the n-th primorial is 2. I.e., such primes q having the least k such that q^k (mod primorial(n)) == 1 is 2.
A336015
Irregular triangle where row n lists primes q below the n-th primorial such that the multiplicative order of q mod the n-th primorial is 2. I.e., such primes q having the least k such that q^k (mod primorial(n)) == 1 is 2.
Terms
- a(0) =5a(1) =11a(2) =19a(3) =29a(4) =29a(5) =41a(6) =71a(7) =139a(8) =181a(9) =419a(10) =461a(11) =659a(12) =769a(13) =881a(14) =1231a(15) =1429a(16) =2309a(17) =1429a(18) =2729a(19) =4159a(20) =5279a(21) =5851a(22) =8009a(23) =8581a(24) =10009a(25) =12011a(26) =12739a(27) =13441a(28) =13859a(29) =14741
External references
- oeis: A336015