A321243 a(n) is the product of n and all its decimal digits individually except the leftmost digit.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 11, 24, 39, 56, 75, 96, 119, 144, 171, 0, 21, 44, 69, 96, 125, 156, 189, 224, 261, 0, 31, 64, 99, 136, 175, 216, 259, 304, 351, 0, 41, 84, 129, 176, 225, 276, 329, 384, 441, 0, 51, 104, 159, 216, 275, 336, 399, 464, 531

Offset: 0

Author

Jacob Swales, Nov 14 2018

Keywords

• nonn
• base

Comments

First differs from A067079 at n=102: A067079(102) = 408 != a(102) = 0.

Examples

			a(33) = 33*3 = 99. a(234) = 234*3*4 = 2808.
		

Links

• Jacob Swales, Table of n, a(n) for n = 0..10000

Crossrefs

Cf. A067079.

Programs

Mathematica

a[n_] := n * If[n<10, 1, Times@@Rest[IntegerDigits[n]]]; Array[a, 100, 0] (* Amiram Eldar, Nov 15 2018 *)
Table[n Times@@Rest[IntegerDigits[n]],{n,0,60}] (* Harvey P. Dale, Mar 06 2023 *)

Python

def a(n):
    seq_num = n
    for letter in range(len(str(n))):
        if letter != 0:
            seq_num = seq_num * int(str(n)[letter])
    return seq_num