Numbers k with property that k is a peak value in 3x+1 trajectory such that both k+1 and k-1 are prime numbers.
A095385
Numbers k with property that k is a peak value in 3x+1 trajectory such that both k+1 and k-1 are prime numbers.
Terms
- a(0) =4a(1) =72a(2) =180a(3) =192a(4) =228a(5) =240a(6) =312a(7) =600a(8) =1092a(9) =1152a(10) =1428a(11) =1488a(12) =1608a(13) =1620a(14) =1872a(15) =2088a(16) =2112a(17) =2592a(18) =2688a(19) =3000a(20) =3168a(21) =3252a(22) =3360a(23) =3528a(24) =4272a(25) =4548a(26) =4800a(27) =5640a(28) =6552a(29) =6960
External references
- oeis: A095385