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 A028898 Map n = Sum c_i 10^i to a(n) = Sum c_i 3^i. 3
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 21, 22, 23, 24, 25, 26, 27 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS FORMULA a(0)=0, a(n)=3*a(n/10) if n==0 (mod 10), a(n)=a(n-1)+1 otherwise - Benoit Cloitre, Dec 21 2002 PROG (PARI) a(n)=if(n<1, 0, if(n%10, a(n-1)+1, 3*a(n/10))) CROSSREFS Sequence in context: A110805 A061499 A178051 * A081502 A079828 A061229 Adjacent sequences:  A028895 A028896 A028897 * A028899 A028900 A028901 KEYWORD nonn,base AUTHOR EXTENSIONS More terms from Erich Friedman. STATUS approved

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