Intersection of A002061 and A016105.

Terms

a(0) =21a(1) =57a(2) =133a(3) =381a(4) =553a(5) =813a(6) =993a(7) =1057a(8) =1333a(9) =1561a(10) =1641a(11) =1893a(12) =1981a(13) =2653a(14) =2757a(15) =3193a(16) =3661a(17) =5257a(18) =5853a(19) =6973a(20) =8373a(21) =8557a(22) =9121a(23) =9313a(24) =10713a(25) =10921a(26) =12657a(27) =13341a(28) =15253a(29) =15501