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

[[20]] is composite: 2 * 10.

[[20]] is composite: 5 * 4.

Primes up to 20: 2, 3, 5, 7, 11, 13, 17, 19.

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.

hex(19) is 1027.

hex(20) is 1141.

• [[square]]: 400

• [[square root]]: 4.4721

• [[cube]]: 8000

• [[cube root]]: 2.7144

• [[natural log]] (ln): 2.9957

• [[base-10 log]] (log10): 1.3010

• [[base-2 log]] (log2): 4.3219