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 A245342 Sum of digits of n written in fractional base 7/2. 0
 0, 1, 2, 3, 4, 5, 6, 2, 3, 4, 5, 6, 7, 8, 4, 5, 6, 7, 8, 9, 10, 6, 7, 8, 9, 10, 11, 12, 3, 4, 5, 6, 7, 8, 9, 5, 6, 7, 8, 9, 10, 11, 7, 8, 9, 10, 11, 12, 13, 4, 5, 6, 7, 8, 9, 10, 6, 7, 8, 9, 10, 11, 12, 8, 9, 10, 11, 12, 13, 14, 10, 11, 12, 13, 14, 15, 16, 7 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The base 7/2 expansion is unique and thus the sum of digits function is well-defined. LINKS FORMULA a(n) = A007953(A024639(n)). EXAMPLE In base 7/2 the number 14 is represented by 40 and so a(14) = 4 + 0 = 4. PROG (Sage) def base72sum(n): ....L=[n] ....i=1 ....while L[i-1]>=7: ........x=L[i-1] ........L[i-1]=x.mod(7) ........L.append(2*floor(x/7)) ........i+=1 ....return sum(L) [base72sum(w) for w in [0..200]] CROSSREFS Sequence in context: A105257 A125937 A173526 * A203580 A043266 A082120 Adjacent sequences:  A245339 A245340 A245341 * A245343 A245344 A245345 KEYWORD nonn,base AUTHOR Hailey R. Olafson, Jul 18 2014 STATUS approved

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Last modified October 14 14:06 EDT 2019. Contains 328017 sequences. (Running on oeis4.)