Numbers k such that k and k+1 are the product of exactly four distinct primes.

Terms

a(0) =7314a(1) =8294a(2) =8645a(3) =11570a(4) =13629a(5) =13845a(6) =15105a(7) =15554a(8) =16554a(9) =17390a(10) =17654a(11) =18290a(12) =19005a(13) =20405a(14) =20769a(15) =21489a(16) =22010a(17) =22154a(18) =23001a(19) =23114a(20) =23529a(21) =24530a(22) =24765a(23) =24870a(24) =24969a(25) =25346a(26) =26690a(27) =26894a(28) =26961a(29) =27434