Lesser of 2 successive tetraprimes (k, k+4) sandwiching three consecutive not squarefree numbers.

Terms

a(0) =3770a(1) =12122a(2) =12426a(3) =17574a(4) =19158a(5) =22074a(6) =28574a(7) =31506a(8) =40922a(9) =46322a(10) =47382a(11) =50930a(12) =52854a(13) =57174a(14) =60378a(15) =61586a(16) =66174a(17) =72474a(18) =74222a(19) =77231a(20) =78774a(21) =85074a(22) =85526a(23) =87954a(24) =89090a(25) =91322a(26) =91374a(27) =95226a(28) =97622a(29) =99582