89033

Appears in sequences

• Engel expansion of 1/log(10) = 0.434294....at n=14A059184
• Compound filter (summands of A004001 & summands of A005185): a(n) = P(A286541(n), A286559(n)), where P(n,k) is sequence A000027 used as a pairing function, with a(1) = a(2) = 0.at n=37A286560