SEC REGISTRATION NO. 333-127355 FILED PURSUANT TO RULE 424(B)(3) [THE FOLLOWING IS TEXT TO A STICKER TO BE ATTACHED TO THE FRONT COVER OF THE PROSPECTUS IN A MANNER THAT WILL NOT OBSCURE THE RISK FACTORS: SUPPLEMENTAL INFORMATION - The Prospectus of Atlas America Public #15-2005 Program consists of this sticker and the Prospectus dated October 27, 2005.] ATLAS AMERICA PUBLIC #15-2005 PROGRAM SUPPLEMENT NO. 1 DATED MARCH 29, 2006 TO THE PROSPECTUS DATED OCTOBER 27, 2005 OF ATLAS AMERICA PUBLIC #15-2005 PROGRAM This Supplement No. 1 supplements, modifies or supersedes certain information contained in the prospectus of Atlas America Public #15-2005 Program dated October 27, 2005, and must be read in conjunction with such prospectus. The purpose of this Supplement No. 1 is to obtain an SEC Registration Number for Atlas America Public #15-2005(A) L.P. so that it can make its required filings under Section 15(d) of the Securities Exchange Act of 1934. Atlas America Public #15-2005(A) L.P. is the first partnership in a series of up to four limited partnerships in the Atlas America Public #15-2004 Program. Atlas America Public #15-2005(A) L.P. terminated on December 31, 2005 with subscriptions of $52,245,720.