A118952 Characteristic function of numbers that can be written as p+2^k, where p is prime and p less than 2^k (A118957).

0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1

Offset

1,1

Comments

0 <= a(n) <= 1, a(n) <= A109925(n);

a(A118956(n)) = 0, a(A118957(n)) = 1;

A118953(n) = a(A000040(n)).

Links

Table of n, a(n) for n=1..105.

Index entries for characteristic functions

Crossrefs

Sequence in context: A288665 A011759 A316345 * A011668 A236192 A011670

Adjacent sequences: A118949 A118950 A118951 * A118953 A118954 A118955

Keyword

nonn

Author

Reinhard Zumkeller, May 07 2006

Status

approved