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

0,3

Comments

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

Links

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

Example

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

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 *)

Prog

(Python 3) for letter in range(len(str(n))):
            if letter != 0:
              seq_num = seq_num * int(n[letter])
            ##seq_num = a(n)

Crossrefs

Cf. A067079.

Sequence in context: A348179 A349422 A056967 * A067079 A080434 A062567

Adjacent sequences: A321240 A321241 A321242 * A321244 A321245 A321246

Keyword

nonn,base

Author

Jacob Swales, Nov 14 2018

Status

approved