13 5 21 July 8, 2019 16 32 64 128 13 5 210 13 5 21 3 13 5 21 6 13 5 21 4 13 5 215 13 5 21 2 13 5 21 8 5 13 21 sequence 13 21 5 7 13 5 x 21 13 5 mod 21 5 13 211 5 13 217 5 13 21 in roman numerals 5 13 213
