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 A220480 The number of n-digit numbers where last k digits are divisible by the k-th prime for k = 1..n. 0
 5, 15, 36, 52, 48, 34, 18, 11, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There are total 224 numbers and 224246090, 632258960, 824791960, 851750490, and 904719030 are the only 9-digit numbers to satisfy the requirement. LINKS Table of n, a(n) for n=1..9. EXAMPLE There are five one-digit numbers divisible by the first prime so a(1)=5. For two-digit numbers, the second digit must make it divisible by 3 which gives 15 numbers: 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72, 78, 84, 90, 96 to satisfy the requirement. So a(2)=15. CROSSREFS Cf. A079212. Sequence in context: A346890 A333932 A065780 * A105720 A174655 A184631 Adjacent sequences: A220477 A220478 A220479 * A220481 A220482 A220483 KEYWORD nonn,base,fini,full AUTHOR Shyam Sunder Gupta, Aug 07 2013 STATUS approved

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Last modified April 20 15:18 EDT 2024. Contains 371844 sequences. (Running on oeis4.)