HARRISBURG — Paychecks containing the first installment of a 3.6 percent cost-of-living increase went out to Pennsylvania legislators Thursday, while the state Senate made public a list of senators who have repaid or promised to repay a much larger pay raise repealed earlier this month.

Meanwhile, citizen activists who spearheaded grass-roots opposition to the now-defunct pay raise turned up the heat on legislators who have not reimbursed the state for what they collected through "unvouchered expenses" during the four months the law was in force.

The activists held a Capitol news conference and delivered unofficial "invoices" to legislative offices at the Capitol, demanding repayment of the money.

"This Legislature should just go home. They've proven time and time again that they're not on the side of Pennsylvanians," said Russ Diamond, chairman of PACleanSweep, a group that is recruiting candidates to contest incumbent legislators' re-election bids next year.

Many legislators began accepting the raise early through unvouchered expenses. The mechanism allowed lawmakers to collect raises immediately, even though the state constitution says they cannot get raises before the next round of legislative elections.

The Senate clerk's office identified 13 senators — 10 Republicans and three Democrats — who have agreed in writing to repay raises they collected under the repealed law. Among those who have repaid or promised to repay the money is Robert D. Robbins, R-50th, who represents a portion of Butler County.

That leaves 14 senators who have not arranged to repay the money they received as unvouchered expenses.

House officials have said at least 32 of the 131 representatives who accepted the early raises are making repayments. They declined again Thursday to name individual lawmakers.

Brian Preski, House Speaker John Perzel's chief of staff, said lawmakers made "personal decisions" about whether to support the pay raises and that their decisions about whether to pay back any extra money are equally private.

"I just don't think it's right" to unilaterally release that information, he said.

The pay-raise law, approved in the wee hours of July 7 without hearings or debate just before legislators broke for their summer vacation, increased legislative salaries by 16 percent to 54 percent. The law, which included smaller increases for about 1,000 state judges, was repealed after four months of public outage and polls that showed many legislators' re-election prospects on a downward slide.

The cost-of-living increase that took effect Thursday was authorized under a law enacted in 1995. It boosted the base salary from less than $70,000 to more than $72,000. The repealed law set the base salary at $81,050.

Gene Stilp, a Harrisburg activist whose lawsuit challenging the raises was dismissed Wednesday by the state Commonwealth Court, vowed to press the state Supreme Court — either through an appeal or a separate action — for a ruling on the legality of unvouchered expenses. The court upheld the payments in a similar case 19 years ago.

Stilp also questioned the legality of lawmakers' using money supposedly earmarked for legislative expenses for personal purposes.

One senator has said he used the money to install a new water heater in his home, while another said it paid for work on his chimney. Other legislators have said they contributed their raises to charity.