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 A230405 a(n) = A000217(A230404(n+1)); the first differences of A219650. 6
 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 6, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 6, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 6, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 6, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 10, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 6, 1, 1, 3, 1, 1, 3, 1, 1, 3, 1, 1, 6, 1, 1, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Construction: Count the trailing zeros in the factorial base representation (A007623) of 2n+2 (2, 4, 6, 8, ...) and then take the corresponding triangular number from A000217. LINKS Antti Karttunen, Table of n, a(n) for n = 0..10079 FORMULA a(n) = A000217(A230404(n+1)). a(n) = A219650(n+1) - A219650(n). PROG (Scheme, two variants) (define (A230405 n) (A000217 (A230404 (+ 1 n)))) (define (A230405 n) (- (A219650 (+ n 1)) (A219650 n))) CROSSREFS First differences of A219650. Can be used to compute A219650 and A230412. Cf. also A230413. Sequence in context: A109007 A132951 A228925 * A101685 A238737 A049653 Adjacent sequences:  A230402 A230403 A230404 * A230406 A230407 A230408 KEYWORD nonn AUTHOR Antti Karttunen, Oct 31 2013 STATUS approved

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Last modified September 20 17:41 EDT 2021. Contains 347588 sequences. (Running on oeis4.)