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A093051 Exponent of 2 in (3^n-3)*2^n. 2
0, 1, 4, 3, 7, 5, 8, 7, 12, 9, 12, 11, 15, 13, 16, 15, 21, 17, 20, 19, 23, 21, 24, 23, 28, 25, 28, 27, 31, 29, 32, 31, 38, 33, 36, 35, 39, 37, 40, 39, 44, 41, 44, 43, 47, 45, 48, 47, 53, 49, 52, 51, 55, 53, 56, 55, 60, 57, 60, 59, 63, 61, 64, 63, 71, 65, 68, 67, 71 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..68.

FORMULA

Recurrence: a(2n) = a(n) + [(n+1)/2] + 1, a(2n+1) = 2n+1.

PROG

(PARI) a(n)=if(n<1, 0, if(n%2==0, a(n/2)+2*floor((n+2)/4)+1, n)

CROSSREFS

a(n) is the exponent of 2 in A009613(n), A010043(n), A010046(n), A012388(n-1), A009518(n), A012391(n-1), A012457(n-1), A012458(n-1), A012461(n-1), A012462(n-2).

Cf. A093050, A093052.

Sequence in context: A198874 A276760 A257876 * A089020 A046560 A131413

Adjacent sequences:  A093048 A093049 A093050 * A093052 A093053 A093054

KEYWORD

nonn

AUTHOR

Ralf Stephan, Mar 16 2004

STATUS

approved

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Last modified October 20 20:08 EDT 2019. Contains 328271 sequences. (Running on oeis4.)