Prime worms [successive digit differences with absolute value of 2].

Terms

a(0) =131a(1) =313a(2) =353a(3) =757a(4) =797a(5) =35353a(6) =35753a(7) =75797a(8) =79757a(9) =97579a(10) =3131353a(11) =3135313a(12) =3531313a(13) =7535797a(14) =313131353a(15) =313135313a(16) =313579753a(17) =353535313a(18) =357531313a(19) =357531353a(20) =357535753a(21) =357575753a(22) =357975353a(23) =753535357a(24) =757975357a(25) =975353579