Numbers m such that m^2+1 is semiprime with (m-1)^2+1 and (m+1)^2+1 primes.

Terms

a(0) =3a(1) =5a(2) =15a(3) =25a(4) =205a(5) =715a(6) =1095a(7) =1315a(8) =1615a(9) =2055a(10) =2405a(11) =2925a(12) =3755a(13) =4615a(14) =4795a(15) =5015a(16) =5055a(17) =5475a(18) =6785a(19) =7855a(20) =8115a(21) =8175a(22) =9425a(23) =9475a(24) =10415a(25) =10845a(26) =11025a(27) =11245a(28) =12335a(29) =12765