Triangular numbers t such that t - 4, t - 2, t + 2, t + 4 are four primes.

Terms

a(0) =15a(1) =105a(2) =1485a(3) =18915a(4) =666435a(5) =2143485a(6) =4174605a(7) =10059855a(8) =10440165a(9) =28196295a(10) =95295915a(11) =124591005a(12) =155064855a(13) =171023265a(14) =206258205a(15) =298400235a(16) =311737965a(17) =347701635a(18) =389470095a(19) =459332895a(20) =460424685a(21) =498948255a(22) =526517475a(23) =537575655a(24) =615496155a(25) =645500415a(26) =885763005a(27) =963144105