A105357 Rearrangement of positive integers: parity of a[n] is opposite to parity of n-th digit of decimal expansion of Pi (see comments).

2, 4, 1, 6, 8, 3, 10, 12, 14, 5, 7, 16, 18, 20, 9, 22, 24, 26, 28, 11, 30, 13, 15, 17, 19, 21, 23, 32, 34, 25, 36, 27, 38, 40, 42, 29, 31, 33, 35, 37, 44, 46, 48, 50, 39, 52, 54, 56, 58, 60, 62, 64, 66, 41, 68, 43, 45, 47, 70, 72, 49, 74, 51, 53, 76, 78, 55, 80, 57, 82, 59, 84

Offset

1,1

Comments

Take decimal expansion of pi: 3,1,4,1,5,9,2,6,5,... First digit pi(1)=3, hence a(1)=2; pi(2)=1, hence a(2)=4, pi(3)=4, hence a(3)=1, etc.

Links

Table of n, a(n) for n=1..72.

Crossrefs

Cf. A105353 - A105360.

Sequence in context: A249144 A080032 A297121 * A346246 A167546 A011369

Adjacent sequences: A105354 A105355 A105356 * A105358 A105359 A105360

Keyword

nonn,base

Author

Zak Seidov, Apr 01 2005

Status

approved