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A241143 Numbers n such that n and 7n share at least one digit. 5
5, 10, 13, 15, 16, 17, 18, 19, 20, 21, 25, 26, 29, 30, 31, 32, 33, 34, 35, 39, 40, 42, 43, 45, 49, 50, 51, 53, 55, 60, 64, 65, 66, 67, 68, 70, 71, 75, 80, 83, 84, 85, 86, 90, 95, 96, 97, 98, 99, 100, 101, 102, 103, 105, 107, 110, 113, 115, 116, 117, 118, 120, 123, 125, 126, 128, 129, 130, 131, 132, 133, 134, 135, 139, 140 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
All numbers n which are congruent to 0 (mod 5) have this characteristic.
LINKS
EXAMPLE
13 is in the sequence since 13 and 7*13 = 91 and together they share the digit 1.
MATHEMATICA
fQ[n_] := Intersection[ IntegerDigits[ n], IntegerDigits[7 n]] != {}; Select[ Range[ 100], fQ]
CROSSREFS
Sequence in context: A313377 A224448 A046130 * A073503 A313378 A226386
KEYWORD
base,easy,nonn
AUTHOR
Robert G. Wilson v, Apr 16 2014
STATUS
approved

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Last modified May 23 01:37 EDT 2024. Contains 372758 sequences. (Running on oeis4.)