A sequence of primes starting with p_1 = 2, p_2 = 3, p_3 = 5, p_4 = 11, p_5 = 13, p_6 = 23, such that, for i >= 7, (p_i + 1)/2 divides the product p_1*p_2*...*p_(i-1) of the earlier primes and each prime factor of (p_i-1)/2 is a prime factor of the product p_1*p_2*...*p_(i-1).
A358719
A sequence of primes starting with p_1 = 2, p_2 = 3, p_3 = 5, p_4 = 11, p_5 = 13, p_6 = 23, such that, for i >= 7, (p_i + 1)/2 divides the product p_1*p_2*...*p_(i-1) of the earlier primes and each prime factor of (p_i-1)/2 is a prime factor of the product p_1*p_2*...*p_(i-1).
Terms
- a(0) =2a(1) =3a(2) =5a(3) =11a(4) =13a(5) =23a(6) =19a(7) =37a(8) =73a(9) =109a(10) =131a(11) =229a(12) =457a(13) =571a(14) =1459a(15) =1481a(16) =2179a(17) =2621a(18) =2917a(19) =2963a(20) =4357a(21) =8713a(22) =49921a(23) =1318901a(24) =3391489a(25) =6782977a(26) =13565953
External references
- oeis: A358719