The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A057147 a(n) = n times sum of digits of n. 22
 0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 10, 22, 36, 52, 70, 90, 112, 136, 162, 190, 40, 63, 88, 115, 144, 175, 208, 243, 280, 319, 90, 124, 160, 198, 238, 280, 324, 370, 418, 468, 160, 205, 252, 301, 352, 405, 460, 517, 576, 637, 250, 306, 364, 424, 486, 550, 616 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS A056992(n) = A010888(a(n)). - Reinhard Zumkeller, Mar 19 2014 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..10000 F. B. Diniz, About a new family of sequences, arXiv:1607.06082 [math.GM], 2016. FORMULA a(n) = n*A007953(n). - Michel Marcus, Aug 10 2014 G.f.: x * (d/dx) (1/(1 - x))*Sum_{k>=1} (x^k - x^(10^k+k) - 9*x^(10^k))/(1 - x^(10^k)). - Ilya Gutkovskiy, Mar 27 2018 MAPLE for n from 0 to 150 do printf(`%d, `, n*add(convert(n, base, 10)[i], i=1..nops(convert(n, base, 10)))) od: MATHEMATICA Table[n*Total[IntegerDigits[n]], {n, 0, 100}] PROG (Haskell) a057147 n = a007953 n * n  -- Reinhard Zumkeller, Mar 19 2014 (PARI) a(n) = n*sumdigits(n) \\ Franklin T. Adams-Watters, Aug 03 2014 (Python) [n*sum([int(d) for d in str(n)]) for n in range(10**5)] # Chai Wah Wu, Aug 05 2014 CROSSREFS Cf. A007953, A003634, A005349, A052489, A052490, A003635, A245788. Iterations: A047892 (start=2), A047912 (start=3), A047897 (start=5), A047898 (start=6), A047899 (start=7), A047900 (start=8), A047901 (start=9), A047902 (start=11). Sequence in context: A068522 A048385 A230101 * A213630 A061205 A290934 Adjacent sequences:  A057144 A057145 A057146 * A057148 A057149 A057150 KEYWORD nonn,base,easy,look AUTHOR N. J. A. Sloane, Sep 13 2000 EXTENSIONS More terms from James A. Sellers and Larry Reeves (larryr(AT)acm.org), Sep 13 2000 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 16 21:58 EDT 2021. Contains 343051 sequences. (Running on oeis4.)