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A061116
Numbers coprime to each of their decimal digits.
4
11, 13, 17, 19, 21, 23, 27, 29, 31, 37, 41, 43, 47, 49, 51, 53, 57, 59, 61, 67, 71, 73, 79, 81, 83, 87, 89, 91, 97, 111, 113, 117, 119, 121, 127, 131, 133, 137, 139, 141, 143, 149, 151, 157, 161, 163, 167, 169, 171, 173, 177, 179, 181, 187, 191, 193, 197, 199, 211
OFFSET
1,1
COMMENTS
A138707(a(n)) = 1; subsequence of A138708. - Reinhard Zumkeller, Mar 26 2008
EXAMPLE
27 is a member as 2 and 7 both are coprime to 27. 53 is a member as 5 and 3 both are coprime to 53.
MAPLE
for n from 2 to 500 do it1 := convert(n, base, 10): flag := 1: for k from 1 to nops(it1) do if igcd(n, it1[k])<>1 then flag := 0 fi: od: if flag=1 then printf(`%d, `, n) fi: od:
MATHEMATICA
Select[Range[11, 191, 2], CoprimeQ[Product[i, {i, IntegerDigits[#]}], #] &] (* Arkadiusz Wesolowski, May 19 2012 *)
PROG
(Python)
from math import gcd
def ok(n): return n > 1 and all(gcd(n, int(d)) == 1 for d in str(n))
print([k for k in range(212) if ok(k)]) # Michael S. Branicky, Nov 13 2021
CROSSREFS
Sequence in context: A055239 A352154 A138708 * A333237 A048388 A068191
KEYWORD
nonn,base
AUTHOR
Amarnath Murthy, Apr 21 2001
EXTENSIONS
More terms from James A. Sellers, Apr 23 2001
STATUS
approved