A055097 Number of divisors for each term in the triangle A055096. It is 2 for primes (all of the form 4k+1).

2, 4, 2, 2, 6, 3, 4, 2, 4, 2, 2, 8, 6, 6, 2, 6, 2, 4, 4, 4, 4, 4, 6, 2, 10, 2, 9, 2, 4, 4, 12, 2, 4, 6, 8, 4, 2, 8, 2, 6, 4, 8, 2, 6, 2, 4, 4, 8, 2, 4, 2, 8, 4, 4, 4, 4, 6, 6, 12, 3, 18, 2, 10, 9, 6, 4, 8, 2, 4, 4, 4, 4, 4, 2, 8, 2, 8, 2, 2, 12, 4, 6, 4, 8, 6, 12, 2, 8, 2, 12, 4, 4, 2, 12, 2, 8, 6, 4, 3

Offset

1,1

Links

Table of n, a(n) for n=1..99.

Maple

sum2distinct_squares_array := (n) -> (((n-((trinv(n-1)*(trinv(n-1)-1))/2))^2)+((trinv(n-1)+1)^2));
with(numtheory, tau); a(n) = tau(sum2distinct_squares_array(n))

Crossrefs

Cf. A055132.

Sequence in context: A058384 A255671 A330590 * A258751 A280233 A279902

Adjacent sequences: A055094 A055095 A055096 * A055098 A055099 A055100

Keyword

nonn,tabl

Author

Antti Karttunen, Apr 04 2000

Status

approved