A096991 Initial values for f(x)=sigma(phi[x])=A062402[x] such that iteration of f ends in cycle of length=4.

401, 451, 489, 491, 505, 513, 567, 577, 629, 631, 652, 661, 673, 679, 685, 691, 713, 731, 737, 751, 757, 769, 773, 791, 802, 808, 811, 817, 825, 829, 833, 847, 851, 853, 859, 867, 869, 871, 873, 877, 889, 893, 899, 901, 902, 907, 911, 917, 919, 923, 931