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

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

[[40]] is composite: 5 * 8.

Primes up to 40: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37.

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.

hex(21) is 1261.

hex(22) is 1387.

hex(23) is 1519.

hex(24) is 1657.

hex(25) is 1801.

hex(26) is 1951.

hex(27) is 2107.

hex(28) is 2269.

hex(29) is 2437.

hex(30) is 2611.

hex(31) is 2791.

hex(32) is 2977.

hex(33) is 3169.

hex(34) is 3367.

hex(35) is 3571.

hex(36) is 3781.

hex(37) is 3997.

hex(38) is 4219.

hex(39) is 4447.

hex(40) is 4681.

• [[square]]: 1600

• [[square root]]: 6.3246

• [[cube]]: 64000

• [[cube root]]: 3.4200

• [[natural log]] (ln): 3.6889

• [[base-10 log]] (log10): 1.6021

• [[base-2 log]] (log2): 5.3219