A285211 Numbers k that share no digits with the k-th triangular number.

2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 24, 26, 28, 29, 30, 31, 33, 34, 38, 39, 42, 44, 46, 47, 48, 49, 52, 58, 59, 62, 64, 66, 69, 70, 71, 77, 79, 82, 84, 86, 88, 89, 114, 115, 117, 122, 124, 129, 131, 132, 246, 252, 258, 259, 262, 266, 270, 271, 277, 282, 286

Offset: 1

Author

Colin Barker, Apr 13 2017

Keywords

• nonn
• base

Links

• Robert Israel, Table of n, a(n) for n = 1..6434

Crossrefs

Cf. A000217, A029783.

Programs

Maple

filter:= proc(n) convert(convert(n,base,10),set) intersect convert(convert(n*(n+1)/2,base,10),set) = {} end proc:
select(filter, [$1..1000]); # Robert Israel, Apr 21 2017

PARI

L=List(); for(n=1, 500, if(setintersect(vecsort(digits(n),,8), vecsort(digits(n*(n+1)/2),,8))==[], listput(L, n))); Vec(L)