A078377 Number of distinct prime factors of numbers which can be written as sum of a positive square and a positive cube.

1, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 1, 2, 1, 2, 3, 1, 1, 2, 2, 2, 2, 2, 3, 2, 2, 2, 3, 2, 3, 2, 2, 2, 2, 1, 3, 2, 2, 2, 3, 1, 2, 2, 2, 1, 1, 3, 3, 1, 3, 3, 2, 1, 3, 1, 1, 3, 3, 2, 2, 2, 2, 2, 2, 1, 2, 1, 3, 2, 2, 1, 1, 3, 2, 2, 2, 1, 2, 3, 2, 2, 1, 2, 3, 2, 3, 2

Offset

1,4

Comments

a(n)=A001221(A055394(n)).

Links

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

Crossrefs

Cf. A078378, A078379.

Sequence in context: A134193 A230259 A085030 * A291454 A105697 A340456

Adjacent sequences: A078374 A078375 A078376 * A078378 A078379 A078380

Keyword

nonn

Author

Reinhard Zumkeller, Nov 25 2002

Status

approved