postgreSQL: generate big data of unique numbers

Sources:

• How to generate random unique number in PostgreSQL using function
• How can I generate big data sample for Postgresql using generate_series and random?

CREATE OR REPLACE FUNCTION jerome_pseudo_encrypt(VALUE int) returns int AS $$
DECLARE
l1 int;
l2 int;
r1 int;
r2 int;
i int:=0;
BEGIN
 l1:= (VALUE >> 16) & 65535;
 r1:= VALUE & 65535;
 WHILE i < 3 LOOP
   l2 := r1;
   r2 := l1 # ((((1366 * r1 + 150889) % 714025) / 714025.0) * 32767)::int;
   l1 := l2;
   r1 := r2;
   i := i + 1;
 END LOOP;
 RETURN ((r1 << 16) + l1);
END;
$$ LANGUAGE plpgsql strict immutable;

create sequence jerome_seq maxvalue 2147483647;
create table prov_db.dt_hpe_dev (hpe_dev_id bigserial, sim_id bigint, constraint dt_hpe_dev_pkey primary key (hpe_dev_id));
insert into prov_db.dt_hpe_dev (sim_id) select jerome_pseudo_encrypt(nextval('jerome_seq')::int)  from generate_series(1, 1000000);