Totients of consecutive pure powers of primes.

Terms

a(0) =2a(1) =4a(2) =6a(3) =8a(4) =20a(5) =18a(6) =16a(7) =42a(8) =32a(9) =54a(10) =110a(11) =100a(12) =64a(13) =156a(14) =162a(15) =128a(16) =272a(17) =294a(18) =342a(19) =256a(20) =506a(21) =500a(22) =486a(23) =812a(24) =930a(25) =512a(26) =1210a(27) =1332a(28) =1640a(29) =1806