OFFSET
1,1
EXAMPLE
a(1) = 14 and 4*14 = 56 is not divisible by 5 or 6;
a(2) = 17 and 4*17 = 68 is not divisible by 6 or 8;
a(3) = 19 and 4*19 = 76 is not divisible by 7 or 6;
a(4) = 77 and 4*77 = 308 is not divisible by 3, 0 or 8; etc.
26 is not in the sequence as 4*26 = 104 is divisible by 1 (and 4).
MATHEMATICA
q[n_] := AllTrue[IntegerDigits[4*n], # == 0 || !Divisible[4*n, #] &]; Select[Range[1270], q] (* Amiram Eldar, Mar 14 2022 *)
PROG
(Python)
def ok(n): return not any(4*n%int(d)==0 for d in set(str(4*n)) if d!='0')
print([k for k in range(1, 978) if ok(k)]) # Michael S. Branicky, Mar 14 2022
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Eric Angelini and Carole Dubois, Mar 14 2022
STATUS
approved