Hi Seqfans, Jon Maiga found (cf. http://sequencedb.net/s/A019594) 5 (for me) astonishing relations that are true to high indices, among them: A019594(n) = A005206(n) + A019588(n) (1000 terms). I would be grateful if somebody could confirm this (and/or the other 4) for all n. Best regards Georg