A319701 Filter sequence for sequences that are constant for all odd terms >= 3.

1, 2, 3, 4, 3, 5, 3, 6, 3, 7, 3, 8, 3, 9, 3, 10, 3, 11, 3, 12, 3, 13, 3, 14, 3, 15, 3, 16, 3, 17, 3, 18, 3, 19, 3, 20, 3, 21, 3, 22, 3, 23, 3, 24, 3, 25, 3, 26, 3, 27, 3, 28, 3, 29, 3, 30, 3, 31, 3, 32, 3, 33, 3, 34, 3, 35, 3, 36, 3, 37, 3, 38, 3, 39, 3, 40, 3, 41, 3, 42, 3, 43, 3, 44, 3, 45, 3, 46, 3, 47, 3, 48, 3, 49, 3, 50, 3, 51, 3, 52, 3, 53, 3, 54, 3, 55, 3, 56, 3, 57, 3, 58, 3, 59, 3, 60, 3, 61, 3, 62

Offset: 1

Author

Antti Karttunen, Oct 02 2018

Keywords

• nonn

Comments

For all i, j:

A305801(i) = A305801(j) => A305890(i) = A305890(j) => a(i) = a(j).

a(i) = a(j) => A007814(i) = A007814(j) => A000035(i) = A000035(j).

Links

• Antti Karttunen, Table of n, a(n) for n = 1..100000

Crossrefs

Cf. A305801, A305890, A319702.

Programs

PARI

A319701(n) = if(n<=2, n, if(n%2, 3, 2+(n/2)));

Formula

a(1) = 1, and for n > 1, if n is odd, a(n) = 3, otherwise [when n is even], a(n) = 2+(n/2).