VOOZH about

URL: https://oeis.org/A107799

⇱ A107799 - OEIS

login
A107799
Indices of primes occurring in A107798.
2
1, 2, 3, 4, 5, 9, 15, 17, 18, 21, 24, 26, 48, 87, 102, 110, 143, 161, 177, 345, 604, 671, 797, 927, 1008, 1346, 2491, 5140, 7942, 19798, 41539, 49943, 58202, 63958, 86538, 164167, 412897, 546742, 1402294, 2433676, 3063731, 4241134, 5216955, 6363488, 12238270, 16252329, 21896835
OFFSET
1,2
FORMULA
a(n) = primepi(A107798(n)).
MATHEMATICA
d=2; e=3; b={2, 3}; id[t_]:=IntegerDigits[t]; Do[p=Prime[n]; If[Intersection[Union[id[d], id[e]], id[p]]=={}, b=Append[b, n]; d=e; e=p], {n, 100000}]; b
CROSSREFS
Sequence in context: A222437 A060732 A068584 * A329049 A385747 A003271
KEYWORD
nonn,base
AUTHOR
Zak Seidov, May 24 2005
EXTENSIONS
a(36)-a(47) from Jason Yuen, Jan 01 2026
STATUS
approved