Independence Day Maths

 ⭕TMF

Telangana Maths Forum

Independence Day Special Mathematics

Specialty of Today's date: 15821

▪︎15=8×2–1=(8÷2¹)!–(8+2–1)=[(8÷2)!+1]–(8+2¹)

▪︎1+5=8–2¹, 1×5=8–2–1=8÷2+1

▪︎1+5+8+2+1, 15+8²×1, 15²×8+1, 158×2+1, 15×82+1, 15×82–1, 15(8+2)+1, 15(8+2)–1, (15×8)²+1 are primes

▪︎15821, Mirror no.12851, 1+5+8+21, 15+8+2+1, 158+2+1, 15+8+2¹, 15+8–2¹, 15+8–1², 1×58²+1, 15×8²+1, 15×8²–1, 15×8+2+1, 15×8+21, 15×8–1², 15×8+2¹, 15×8–2¹, 15×2+8¹, 15²×8–1, 1²+5²+8²+2²+1², (15+8)²×1 are semiprimes

▪︎1+5+82+1 is *(15+8+2–1)th Prime*

▪︎1+58+2+1 is *(15+8–2+1)nd Semiprime*

▪︎158+21 is *15th Good, Long prime*

▪︎158–21 is *15th Pythagorean & (1+5+8+2+1)th Left-truncatable prime*

▪︎1582+1 is *(158+2–1)th Chen prime*

▪︎15×8×2+1 is *[(1+5+8)2+1]th Solinas prime*

▪︎15×8×2–1 is *15th Right-truncatable & (1+5+8+2+1)th Sophie Germain prime*

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