15 Years On 15 Years On 15 Years On is the eleventh studio album by the Irish folk band The Dubliners. This album was created to celebrate the band's 15th anniversary from the day they started music together. The album was released on the Chyme label in 1977. The album features 24 tracks on two records (nine of which were previously unreleased). In spite of having only nine previously unreleased tracks, it is still regarded as an original album. The group's line-up consisted of Barney McKenna, Luke Kelly, John Sheahan and Jim McCann. (Ronnie Drew and Ciarán Bourke feature on a number of
15 (number) 15 (number) 15 (fifteen) is a number, numeral, and glyph. It is the natural number following 14 and preceding 16. 15 is: There are 15 perfect matchings of the complete graph "K" and 15 rooted binary trees with four labeled leaves, both of these being among the types of object counted by double factorials. With only two exceptions, all prime quadruplets enclose a multiple of 15, with 15 itself being enclosed by the quadruplet (11, 13, 17, 19). Because 15 is the product of distinct Fermat primes, 3 and 5, a regular polygon with 15 sides is constructible with compass