Created
July 4, 2020 02:53
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Get all numbers 3 digits, divisible by 3 that follow this formula, a + 3b + c where a != 0
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| # Get all numbers 3 digits, divisible by 3 that follow this formula | |
| # a + 3b + c where a != 0 | |
| library(tidyr) | |
| count <- 0 | |
| n <- c() | |
| for( i in 100:999) { | |
| digits <- as.integer(substring(i, seq(nchar(i)), seq(nchar(i)))) | |
| formula <- (digits[1] + 3*digits[2] + digits[3]) | |
| if ( ( formula %% 3 ) == 0 ) { | |
| count = count + 1 | |
| n[count] <- i | |
| } | |
| } | |
| print(count) |
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