I urge anyone truly interested in facts to play around with the data in Factba.se.
From a CNN excerpt on the number of times Trump mentions Obama:
"Trump used Obama's name 106 times in June, the most of any month of his presidency; 80 times in October, his third-highest monthly total; 68 times in July, his fourth-highest monthly total; 61 times in August, his fifth-highest monthly total; and 51 times in September, his ninth-highest monthly total.
Over the five-month period, Trump mentioned Obama an average of 2.4 times per day. If you add in his 69 mentions of the "previous administration" or "last administration," it was 2.8 times per day.
Through October, Trump had mentioned Obama by name 537 times during 2019 as a whole -- an average of 1.8 times per day. That's a 36% increase from the 395 mentions (1.3 per day) Trump made of Obama in 2018 through October of that year and a 169% increase from the 200 mentions in 2017 (0.7 per day) through October of that year."