Odd numbers k such that phi(k) = phi(k+2), where phi is the Euler totient function (A000010).

Terms

a(0) =7a(1) =635a(2) =1015a(3) =2695a(4) =6497a(5) =10307a(6) =12317a(7) =13445a(8) =46205a(9) =77693a(10) =81303a(11) =133787a(12) =134995a(13) =151823a(14) =162925a(15) =180633a(16) =181427a(17) =220113a(18) =288925a(19) =359905a(20) =392819a(21) =404471a(22) =439097a(23) =453167a(24) =485237a(25) =682649a(26) =739023a(27) =840851a(28) =879303a(29) =910195