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A071709 Array A(i,j)= T(prime(i)^j) read by antidiagonals, where T(x) denote the "type" of the integer x: T(m)=1 or 2 depending on whether 1 or 2 is a descendant of n in the Half-totient tree. 0
2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 2, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 2, 2, 2, 1, 2, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 2, 2, 2, 1, 2, 1, 2, 1, 1, 2, 1, 1, 2, 1, 1, 1, 2, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..78.

K. S. Brown, The Half-Totient Tree

EXAMPLE

Array begins (rows labeled i=1,2,..., columns labeled j=1,2,3,...):

2 2 1 2 1 2 1 2 1 2...

3 1 1 1 1 1 1 1 1 1...

5 2 2 2 2 2 2 2 2 2...

CROSSREFS

Cf. A023022.

Sequence in context: A175077 A001030 A246140 * A131406 A029440 A061337

Adjacent sequences:  A071706 A071707 A071708 * A071710 A071711 A071712

KEYWORD

easy,nonn,tabl

AUTHOR

Benoit Cloitre, Jun 03 2002

STATUS

approved

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Last modified March 21 10:09 EDT 2019. Contains 321368 sequences. (Running on oeis4.)