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 A280705 a(n) = A002110(A280700(n)) = A046523(A283475(n)). 3
 1, 2, 6, 2, 30, 2, 6, 30, 210, 2, 6, 30, 30, 210, 30, 30, 2310, 2, 6, 30, 30, 210, 30, 30, 210, 2310, 30, 30, 210, 210, 30, 210, 30030, 2, 6, 30, 30, 210, 30, 30, 210, 2310, 30, 30, 210, 210, 30, 210, 2310, 30030, 30, 30, 210, 210, 30, 210, 2310, 2310, 30, 210, 210, 2310, 30030, 210, 510510, 2, 6, 30, 30, 210, 30, 30 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Antti Karttunen, Table of n, a(n) for n = 0..8191 FORMULA a(n) = A002110(A280700(n)) = A046523(A283475(n)). MATHEMATICA Table[Times @@ Prime@ Range@ DigitCount[2 n - DigitCount[2 n, 2, 1], 2, 1], {n, 0, 71}] (* or *) Map[Times @@ MapIndexed[Prime[First[#2]]^#1 &, Reverse@ Sort[FactorInteger[#][[All, -1]]]] - Boole[# == 1] &, Map[Times @@ Prime@ Flatten@ Position[#, 1] &@ Reverse@ IntegerDigits[#, 2] &, Table[2 n - DigitCount[2 n, 2, 1], {n, 0, 71}]]] (* Michael De Vlieger, Mar 18 2017 *) PROG (Scheme) (define (A280705 n) (A002110 (A280700 n))) (define (A280705 n) (A046523 (A283475 n))) CROSSREFS Cf. A002110, A005117, A046523, A280700, A283475. Sequence in context: A076743 A131980 A217448 * A027760 A141056 A141498 Adjacent sequences:  A280702 A280703 A280704 * A280706 A280707 A280708 KEYWORD nonn AUTHOR Antti Karttunen, Mar 16 2017 STATUS approved

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Last modified April 4 21:43 EDT 2020. Contains 333238 sequences. (Running on oeis4.)