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 A316868 Number of times 7 appears in decimal expansion of n. 6
 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,78 LINKS EXAMPLE a(0) = 0 since the decimal representation of 0 does not contain the digit 7. a(7) = 1 since 7 appears once in the decimal expansion of 7. MATHEMATICA Array[ DigitCount[#, 10, 7] &, 105, 0] PROG (PARI) a(n) = #select(x->x==7, digits(n)); \\ Michel Marcus, Jul 20 2018 CROSSREFS Cf. A043517, A043518, A043519, A043520. Cf. A055641, A268643, A316863, A316864, A316865, A316866, A316867, A316869, A102683. Sequence in context: A086073 A053622 A016408 * A106822 A203905 A309142 Adjacent sequences:  A316865 A316866 A316867 * A316869 A316870 A316871 KEYWORD base,easy,nonn AUTHOR Robert G. Wilson v, Jul 15 2018 STATUS approved

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Last modified October 14 16:48 EDT 2019. Contains 328022 sequences. (Running on oeis4.)