A069715 - OEIS

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A069715

GCD of digits of n is 1.

6

1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21, 23, 25, 27, 29, 31, 32, 34, 35, 37, 38, 41, 43, 45, 47, 49, 51, 52, 53, 54, 56, 57, 58, 59, 61, 65, 67, 71, 72, 73, 74, 75, 76, 78, 79, 81, 83, 85, 87, 89, 91, 92, 94, 95, 97, 98, 100, 101, 102, 103, 104, 105, 106, 107, 108

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Index entries for 10-automatic sequences.

FORMULA

A052423(a(n)) = 1. - Reinhard Zumkeller, Apr 14 2014

a(n) ~ n. In fact a(n) = n + O(n^(log 5/log 10)). - Charles R Greathouse IV, Nov 01 2014

EXAMPLE

All numbers with at least one digit equal to 1 are here.

MATHEMATICA

Do[s=Apply[GCD, IntegerDigits[n]]; If[Equal[s, 1], Print[n]], {n, 1, 256}]

PROG

(Haskell)

a069715 n = a069715_list !! (n-1)

a069715_list = filter ((== 1) . a052423) [1..]

-- Reinhard Zumkeller, Apr 14 2014

(PARI) is(n)=gcd(digits(n))==1 \\ Charles R Greathouse IV, Nov 01 2014

CROSSREFS

Cf. A011531 (subsequence), A240913 (subsequence).

Sequence in context: A326734 A256556 A063662 * A248499 A008716 A011531

Adjacent sequences: A069712 A069713 A069714 * A069716 A069717 A069718

KEYWORD

base,easy,nonn

AUTHOR

Labos Elemer, Apr 02 2002

STATUS

approved