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A227187
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Numbers n whose factorial base representation A007623(n) contains at least one nonleading zero. (Zero is also included as a(0)).
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4
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0, 2, 4, 6, 7, 8, 10, 12, 13, 14, 16, 18, 19, 20, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 34, 36, 37, 38, 40, 42, 43, 44, 46, 48, 49, 50, 51, 52, 53, 54, 55, 56, 58, 60, 61, 62, 64, 66, 67, 68, 70, 72, 73, 74, 75, 76, 77, 78, 79, 80, 82, 84, 85, 86, 88, 90, 91
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OFFSET
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0,2
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LINKS
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FORMULA
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a(0) = 0, a(1) = 2, and for n > 1, if a(n-1) is odd or A257510(a(n-1)) > 1, then a(n) = a(n-1) + 1, otherwise a(n) = a(n-1) + 2. - Antti Karttunen, Apr 29 2015
Other identities:
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MATHEMATICA
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q[n_] := Module[{k = n, m = 2, r, s = {}}, While[{k, r} = QuotientRemainder[k, m]; k != 0|| r != 0, AppendTo[s, r]; m++]; MemberQ[s, 0]]; q[0] = True; Select[Range[0, 100], q] (* Amiram Eldar, Feb 07 2024 *)
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PROG
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(definec (A227187 n) (if (<= n 1) (+ n n) (let ((prev (A227187 (- n 1)))) (cond ((odd? prev) (+ 1 prev)) ((> (A257510 prev) 1) (+ 1 prev)) (else (+ 2 prev))))))
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CROSSREFS
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The sequence gives all positions n where A208575 is zero and all terms where A257510 (also A257260) are nonzeros.
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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