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

1,1

Links

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

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

Prog

(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)

Crossrefs

Cf. A000217, A029783.

Sequence in context: A037041 A048263 A141451 * A183217 A047303 A057906

Adjacent sequences: A285208 A285209 A285210 * A285212 A285213 A285214

Keyword

nonn,base

Author

Colin Barker, Apr 13 2017

Status

approved