A264987 Odd bisection of A263272.

1, 3, 5, 11, 9, 7, 13, 15, 23, 29, 33, 17, 35, 27, 19, 37, 21, 25, 31, 39, 41, 95, 45, 59, 113, 69, 77, 83, 87, 47, 101, 99, 65, 119, 51, 71, 89, 105, 53, 107, 81, 55, 109, 57, 73, 91, 111, 43, 97, 63, 61, 115, 75, 79, 85, 93, 49, 103, 117, 67, 121, 123, 203, 257, 285, 149, 311, 135, 167, 329, 177, 221, 275

Offset

0,2

Links

Table of n, a(n) for n=0..72.

Formula

a(n) = A263272((2*n)+1).

Prog

(Scheme) (define (A264987 n) (A263272 (+ 1 n n)))
(Python)
from sympy import factorint
from sympy.ntheory.factor_ import digits
from operator import mul
def a030102(n): return 0 if n==0 else int(''.join(map(str, digits(n, 3)[1:][::-1])), 3)
def a038502(n):
    f=factorint(n)
    return 1 if n==1 else reduce(mul, [1 if i==3 else i**f[i] for i in f])
def a038500(n): return n/a038502(n)
def a263273(n): return 0 if n==0 else a030102(a038502(n))*a038500(n)
def a(n): return a263273(2*(2*n + 1))/2 # Indranil Ghosh, May 23 2017

Crossrefs

Cf. A263272, A264986, A264989.

Sequence in context: A271314 A292006 A105603 * A170835 A122133 A273377

Adjacent sequences: A264984 A264985 A264986 * A264988 A264989 A264990

Keyword

nonn

Author

Antti Karttunen, Dec 05 2015

Status

approved