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A280657 Numbers beginning with their digital root in decimal representation. 1
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 19, 20, 29, 30, 39, 40, 49, 50, 59, 60, 69, 70, 79, 80, 89, 90, 99, 100, 109, 118, 127, 136, 145, 154, 163, 172, 181, 190, 199, 200, 209, 218, 227, 236, 245, 254, 263, 272, 281, 290, 299, 300, 309, 318, 327, 336, 345, 354, 363, 372, 381, 390, 399, 400, 409, 418, 427, 436 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
10% of the nonnegative integers are in the sequence, approximatively.
LINKS
EXAMPLE
The digital root of 10 is 1 and "1" is the first digit of "10", so 10 is in the sequence.
The digital root of 11 is 2 and "2" is not the first digit of "11", so 11 is not in the sequence.
The digital root of 19 is 1 and "1" is the first digit of "19", so 19 is in the sequence.
CROSSREFS
Sequence in context: A207506 A343131 A119246 * A117241 A108191 A108193
KEYWORD
nonn,base
AUTHOR
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)