User talk:Hello285489

Welcome!
Hi, Hello285489. Welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Our intro page contains a lot of helpful material for new users—please check it out! If you need help, visit Questions, ask me on my talk page, or. GABgab 18:54, 25 March 2019 (UTC)

March 2019
Hello, I'm CLCStudent. I wanted to let you know that one or more of your recent contributions to Collatz conjecture have been undone because they did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help Desk. Thanks. CLCStudent (talk) 18:46, 25 March 2019 (UTC)

Please do not add or change content, as you did at Space policy of the Barack Obama administration, without citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. Dirkbb (talk) 19:32, 25 March 2019 (UTC)