[[18]] is not prime. Want proof? :)

[[18]] is composite: 2 * 9.

[[18]] is composite: 3 * 6.

Primes up to 18: 2, 3, 5, 7, 11, 13, 17.

hex(1) is 1.

hex(2) is 7.

hex(3) is 19.

hex(4) is 37.

hex(5) is 61.

hex(6) is 91.

hex(7) is 127.

hex(8) is 169.

hex(9) is 217.

hex(10) is 271.

hex(11) is 331.

hex(12) is 397.

hex(13) is 469.

hex(14) is 547.

hex(15) is 631.

hex(16) is 721.

hex(17) is 817.

hex(18) is 919.

• [[square]]: 324

• [[square root]]: 4.2426

• [[cube]]: 5832

• [[cube root]]: 2.6207

• [[natural log]] (ln): 2.8904

• [[base-10 log]] (log10): 1.2553

• [[base-2 log]] (log2): 4.1699