A352735 Lucky numbers in Chinese: Numbers whose decimal expansion contains 8 but not 4.

8, 18, 28, 38, 58, 68, 78, 80, 81, 82, 83, 85, 86, 87, 88, 89, 98, 108, 118, 128, 138, 158, 168, 178, 180, 181, 182, 183, 185, 186, 187, 188, 189, 198, 208, 218, 228, 238, 258, 268, 278, 280, 281, 282, 283, 285, 286, 287, 288, 289, 298, 308, 318, 328, 338, 358

Offset: 1

Author

Charles R Greathouse IV, Mar 30 2022

Keywords

• nonn
• base
• easy

Comments

The number 8 (八) sounds like 发 = "to get rich". The number 4 (四) sounds like 死 = "to die". Many numbers are auspicious or inauspicious in Chinese numerology but these are perhaps the most common.

Crossrefs

Intersection of A052406 and A011538.

Programs

PARI

is(n)=setintersect(Set(digits(n)),[4,8])==[8]

Formula

a(n) ≍ n^k where k = A154160 = 1.047951637....