A006530(x)=2 is a local minimum if x=2^n. Running upward with argument x, the largest prime divisor should increase. The value of first peak is a(n).

A102643

A006530(x)=2 is a local minimum if x=2^n. Running upward with argument x, the largest prime divisor should increase. The value of first peak is a(n).

Terms

    a(0) =3a(1) =5a(2) =11a(3) =17a(4) =17a(5) =13a(6) =43a(7) =257a(8) =257a(9) =41a(10) =683a(11) =4099a(12) =2731a(13) =2731a(14) =331a(15) =65537a(16) =65537a(17) =262147a(18) =174763a(19) =174763a(20) =61681a(21) =199729a(22) =2796203a(23) =2796203a(24) =4051a(25) =9586981a(26) =87211a(27) =15790321a(28) =15790321a(29) =1073741827

External references