The product of primes <= n that are strongly prime to n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =1a(7) =5a(8) =15a(9) =35a(10) =7a(11) =21a(12) =35a(13) =385a(14) =165a(15) =143a(16) =1001a(17) =15015a(18) =5005a(19) =85085a(20) =51051a(21) =46189a(22) =20995a(23) =440895a(24) =1616615a(25) =7436429a(26) =1716099a(27) =2860165a(28) =5311735a(29) =15935205