A070828 Sum of prime factors of Catalan numbers A000108(n), n>=2, with n=0 and n=1 terms added.

1, 1, 2, 5, 9, 12, 18, 27, 31, 43, 53, 58, 70, 73, 76, 99, 115, 123, 118, 148, 156, 186, 208, 212, 251, 252, 265, 309, 298, 312, 342, 395, 396, 397, 454, 472, 508, 562, 561, 570, 610, 612, 654, 663, 686, 752, 727

Offset: 0

Author

Wolfdieter Lang, May 10 2002

Keywords

• nonn
• easy

Comments

a(0) := 1=: a(2) for A000108(0)= 1 = A000108(1). Sometimes a(0)= 0 =a(1) is chosen instead.

Crossrefs

Cf. A001414 (for natural numbers), A064725 (for Fibonacci), A070827 (for Lucas).