Numbers k such that k^2+1 = 2p,(k+1)^2+1 = 5q, (k+2)^2+1 = 10r where p, q, and r are primes.

Terms

a(0) =11a(1) =51a(2) =61a(3) =101a(4) =221a(5) =261a(6) =571a(7) =2271a(8) =2821a(9) =2871a(10) =5071a(11) =5651a(12) =5761a(13) =6561a(14) =6951a(15) =9751a(16) =10461a(17) =10851a(18) =11621a(19) =11711a(20) =14961a(21) =15911a(22) =16551a(23) =17171a(24) =17601a(25) =18511a(26) =19071a(27) =19551a(28) =23151a(29) =25261