A063462 a(n) = n * last digit of n.

0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 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, 0, 61, 124

Offset

0,3

Links

Harry J. Smith, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,0,0,0,-1).

Formula

a(n) = n * A010879(n).

G.f.: x*(9*x^18 +16*x^17 +21*x^16 +24*x^15 +25*x^14 +24*x^13 +21*x^12 +16*x^11 +9*x^10 +81*x^8 +64*x^7 +49*x^6 +36*x^5 +25*x^4 +16*x^3 +9*x^2 +4*x +1) / ((x -1)^2*(x +1)^2*(x^4 -x^3 +x^2 -x +1)^2*(x^4 +x^3 +x^2 +x +1)^2). - Colin Barker, Feb 07 2014

Mathematica

Table[n NumberDigit[n, 0], {n, 0, 70}] (* Requires Mathematica version 12 or later *) (* Harvey P. Dale, Jul 06 2021 *)

Prog

(PARI) a(n)=n%10*n

Crossrefs

Cf. A010879.

Sequence in context: A115300 A085942 A066308 * A098736 A002015 A257587

Adjacent sequences: A063459 A063460 A063461 * A063463 A063464 A063465

Keyword

base,easy,nonn

Author

Jason Earls, Jul 26 2001

Status

approved