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A120738 a(n)=log2(16^n/A001316(n)). +0
4
0, 3, 7, 10, 15, 18, 22, 25, 31, 34, 38, 41, 46, 49, 53, 56, 63, 66, 70, 73, 78, 81, 85, 88, 94, 97, 101, 104, 109, 112, 116, 119, 127, 130, 134, 137, 142, 145, 149, 152, 158, 161, 165, 168, 173, 176, 180, 183, 190, 193, 197, 200, 205, 208, 212, 215, 221, 224, 228 (list; graph; listen)
OFFSET

0,2

COMMENT

Partial sums of A090739. 2^a(n)=16^n/A001316(n)=A061549(n).

a(n) is also the increasing sequence of exponents of x in the \prod_{k > 1} (1 + x^(2^k - 1)) [From Paul Pearson (ppearson(AT)rochester.edu), Aug 06 2008]

Contribution from Johannes W. Meijer (meijgia(AT)hotmail.com), Jul 06 2009: (Start)

2^a(n) = abs(A067624(n)/A117972(n))

(End)

FORMULA

a(n)=2n+A005187(n); a(n)=3n+A011371(n); a(n)=4n-log2(A001316(n)); a(n)=log2(A061549(n));

a(n) = A086343(n) + A001511(n) for n>0. [From Alford Arnold (Alford1940(AT)aol.com), Mar 23 2009]

MAPLE

a:=n->simplify(log[2](16^n/(add(modp(binomial(n, k), 2), k=0..n)))); a:=n->simplify(log[2](16^n/(2^(n-(padic[ordp](n!, 2)))))); # Note: n-(padic[ordp](n!, 2)) is the number of 1's in the binary expansion of n [From Paul Pearson (ppearson(AT)rochester.edu), Aug 06 2008]

PROGRAM

(PARI) {a(n) = if( n < 0, 0, 4*n - subst( Pol( binary( n ) ), x, 1) ) } /* Michael Somos Aug 28 2007 */

CROSSREFS

A086343 [From Alford Arnold (Alford1940(AT)aol.com), Mar 23 2009]

Sequence in context: A003231 A140487 A043722 this_sequence A085145 A143101 A121016

Adjacent sequences: A120735 A120736 A120737 this_sequence A120739 A120740 A120741

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jun 29 2006

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.


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