A075523 First nonprime reached when starting with the n-th prime p and iterating the map k -> 4*k+(p mod 4), or -1 if no integer is ever reached.
10, 15, 21, 511, 767, 213, 69, 319, 95, 117, 511, 597, 165, 175, 767, 213, 959, 245, 4351, 287, 1173, 319, 335, 357, 1557, 405, 415, 1727, 437, 453, 511, 527, 549, 559, 597, 2431, 629, 655, 671, 693, 46079, 725, 767, 3093, 789, 799, 847, 895, 3647, 917
Offset: 1