A295389 Numbers whose sum of digits is squarefree.

1, 2, 3, 5, 6, 7, 10, 11, 12, 14, 15, 16, 19, 20, 21, 23, 24, 25, 28, 29, 30, 32, 33, 34, 37, 38, 41, 42, 43, 46, 47, 49, 50, 51, 52, 55, 56, 58, 59, 60, 61, 64, 65, 67, 68, 69, 70, 73, 74, 76, 77, 78, 82, 83, 85, 86, 87, 89, 91, 92, 94, 95, 96, 98, 100, 101, 102, 104, 105, 106, 109, 110, 111, 113, 114

Offset

1,2

Comments

Numbers k such that A007953(k) is a term of A005117. - Felix Fröhlich, Nov 21 2017

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

select(n -> numtheory:-issqrfree(convert(convert(n, base, 10), `+`)), [$1..200]); # Robert Israel, Nov 21 2017

Prog

(PARI) is(n) = issquarefree(sumdigits(n));
for(n = 1, 200, if(is(n), print1(n, ", ")))

Crossrefs

Cf. A005117, A007953. Includes A028834.

Sequence in context: A066940 A305318 A100118 * A028781 A136149 A101882

Adjacent sequences: A295386 A295387 A295388 * A295390 A295391 A295392

Keyword

hear,nonn,base

Author

Nile Nepenthe Wynar, Nov 21 2017

Status

approved