A306632 Numbers n which are both lucky (A000959) and Lucas (A000032).

1, 3, 7, 3571, 9349, 710647, 12752043

Offset

1,2

Comments

No more terms below 10^9.

Calculated using Hugo van der Sanden's Lucky numbers up to 10^9.

Links

Table of n, a(n) for n=1..7.

Mathematica

m = 10^4; L = Table[2*i + 1, {i, 0, m}]; For[n = 2, n < Length[L], r = L[[n++]]; L = ReplacePart[L, Table[r*i -> Nothing, {i, 1, Length[L]/r}]]]; lucas = {}; n = 1; While[(l = LucasL[n]) < m, AppendTo[lucas, l]; n++]; Intersection[L, lucas] (* after Jean-François Alcover at A000959 *)

Prog

(Perl) use ntheory ':all'; for (1..35) { my $n = lucasv(1, -1, $_); print "$n\n" if is_lucky($n) } # Daniel Suteu, Mar 02 2019

Crossrefs

Cf. A000032, A000959, A057589, A130594, A140285.

Sequence in context: A349007 A101006 A372769 * A083461 A137029 A174307

Adjacent sequences: A306629 A306630 A306631 * A306633 A306634 A306635

Keyword

nonn,more

Author

Amiram Eldar, Mar 02 2019

Status

approved