First of four consecutive primes p,q,r,s such that q*s - p*r is a square.

Terms

a(0) =5a(1) =13a(2) =137a(3) =353a(4) =877a(5) =5171a(6) =6337a(7) =9397a(8) =11197a(9) =16631a(10) =20011a(11) =31247a(12) =39191a(13) =61261a(14) =110581a(15) =114067a(16) =178537a(17) =182981a(18) =186601a(19) =216317a(20) =251917a(21) =266797a(22) =273349a(23) =296477a(24) =369791a(25) =372707a(26) =427681a(27) =431567a(28) =580787a(29) =889337