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A170827 Sum of digits after the decimal point in the decimal expansion of (3/2)^n. 4
0, 5, 7, 15, 13, 29, 25, 37, 38, 43, 42, 67, 60, 67, 60, 85, 73, 77, 71, 79, 95, 107, 106, 100, 95, 120, 95, 137, 143, 146, 138, 140, 147, 166, 172, 163, 172, 177, 180, 193, 158, 174, 171, 184, 177, 188, 188, 223, 212, 241, 213, 198, 243, 229, 236, 245, 278, 281, 305, 304 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Terms which appear more than once: 60, 67, 95, 172, 177, 188, 330, 346, 350, 377, 407, ..., . - Robert G. Wilson v, Mar 10 2015

First term to appear n times: 0, 60, 95, 3016, 31258, ..., and these happen at {0}, {13, 15}, {21, 25, 27}, {651, 675, 678, 690}, {6917, 6930, 6970, 7001, 7054}, ..., . - Robert G. Wilson v, Mar 10 2015

LINKS

Harvey P. Dale, Table of n, a(n) for n = 0..1000

EXAMPLE

1.0

1.5

2.25

3.375

5.0625

7.59375

11.390625

17.0859375

25.62890625

MATHEMATICA

td[n_]:=Module[{rd=RealDigits[(3/2)^n]}, Total[Drop[rd[[1]], rd[[2]]]]]; Array[td, 60, 0] (* Harvey P. Dale, Dec 13 2011 *)

PROG

(PARI) a(n) = sumdigits(lift(Mod(15, 10^n)^n)) \\ Jianing Song, Sep 28 2022

CROSSREFS

Cf. A002379, A170828.

Sequence in context: A314353 A043099 A030755 * A314354 A314355 A314356

Adjacent sequences: A170824 A170825 A170826 * A170828 A170829 A170830

KEYWORD

nonn,base

AUTHOR

Michel Lagneau, Dec 28 2009

EXTENSIONS

Edited by N. J. A. Sloane, Dec 28 2009

STATUS

approved

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Last modified December 9 19:36 EST 2022. Contains 358703 sequences. (Running on oeis4.)