1,2

A000005(a(n))=A000217(n) and A000005(k)<>n*(n+1)/2 for k<a(n).

Subsequence of A081619.

a(n) = A005179(A000217(n)) = A005179(n*(n+1)/2)

Adjacent sequences: A081617 A081618 A081619 this_sequence A081621 A081622 A081623

Sequence in context: A022016 A032380 A057346 this_sequence A063887 A108508 A019309

nonn

Reinhard Zumkeller (reinhard.zumkeller(AT)lhsystems.com), Mar 24 2003

More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jun 14 2004