A347408 A347338(n) is the a(n)-th number having its number of divisors.

1, 2, 12, 4, 1, 1, 14, 3, 48, 2, 9, 5, 26, 10, 63, 2, 16, 6, 27, 96, 99, 34, 19, 3, 25, 19, 31, 36, 3, 59, 4, 1, 133, 217, 69, 2, 9, 12, 165, 24, 429, 2, 6, 87, 129, 51, 30, 1, 29, 3, 514, 69, 20, 5, 13, 18, 76, 23, 10, 1, 123, 186, 51, 1, 1, 12, 9, 11, 10, 27, 285

Offset

1,2

Links

Table of n, a(n) for n=1..71.

Example

a(3) = 12 as A347338(3) = 35. 35 has 4 divisors and 35 is the 12th number having 4 divisors (after the 11 numbers 6, 8, 10, 14, 15, 21, 22, 26, 27, 33 and 34).

Prog

(PARI) a(n) = my(k = A347338(n), q = numdiv(k), res = 1); for(i = 1, k-1, if(numdiv(i) == q, res++)); res

Crossrefs

Cf. A347338.

Sequence in context: A363932 A317206 A164869 * A248030 A082292 A248588

Adjacent sequences: A347405 A347406 A347407 * A347409 A347410 A347411

Keyword

nonn

Author

David A. Corneth, Aug 30 2021

Status

approved