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A117463 Result of the final iteration of doubling in A117462 to equal or exceed n. 6
2, 4, 6, 8, 10, 12, 14, 16, 18, 16, 16, 12, 16, 20, 24, 28, 32, 18, 20, 32, 24, 32, 40, 24, 28, 32, 36, 40, 44, 48, 32, 40, 48, 56, 64, 36, 40, 44, 48, 64, 80, 48, 56, 64, 72, 80, 88, 48, 52, 80, 96, 56, 64, 72, 80, 88, 96, 104, 112, 96, 112, 64, 72, 80, 88, 96, 104, 112, 120, 112, 128 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..70.

FORMULA

a(n) = 2^A117462(n) * A007953(n). - R. J. Mathar, Sep 25 2018

EXAMPLE

In a(11) = 16: SOD(11) = 2. 2 doubled is 4,8,16, after A117462(11)= 3 iterations.

MAPLE

A117463 := proc(n)

    2^A117462(n)*digsum(n) ;

end proc:

seq(A117463(n), n=1..90) ; # R. J. Mathar, Sep 25 2018

PROG

UBASIC 10 'use of str, mid, len, val 20 'number of doubled iterations required to equal or exceed sod(n)

30 C=C+1

40 D=str(C)

50 E=len(D)

60 for Q=2 to E

70 A=mid(D, Q, 1):G=val(A)

80 I=I+G

90 next Q

100 print C; I; "-";

110 K=I

120 I=0

130 for R=1 to C

140 K=K+K:T=T+1

150 if K>=C then print C; K; T:cancel for:stop:goto 170

160 next R

170 K=0:T=0

180 goto 30

CROSSREFS

Cf. A117462, A169805.

Sequence in context: A070196 A056964 A052008 * A248609 A055960 A007928

Adjacent sequences:  A117460 A117461 A117462 * A117464 A117465 A117466

KEYWORD

easy,nonn,base,less

AUTHOR

Enoch Haga, Mar 18 2006

EXTENSIONS

Extended by R. J. Mathar, Sep 25 2018

STATUS

approved

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Last modified November 13 20:57 EST 2019. Contains 329106 sequences. (Running on oeis4.)