Indices of primes in the tribonacci-like sequence A214827.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =8a(6) =11a(7) =13a(8) =14a(9) =15a(10) =18a(11) =39a(12) =42a(13) =46a(14) =128a(15) =319a(16) =501a(17) =645a(18) =749a(19) =785a(20) =924a(21) =1786a(22) =1810a(23) =3032a(24) =3053a(25) =3913a(26) =4444a(27) =5611a(28) =6290a(29) =20526