A084250 Let a(1) = 1; for n>1, let a(n) be smallest positive integer distinct from all earlier terms such that exp(Sum_{n>=1} a(n)*x^n/n) has integer coefficients (cf. A084251).

1, 3, 4, 7, 6, 12, 8, 15, 13, 18, 23, 16, 14, 10, 9, 31, 35, 21, 20, 2, 11, 25, 24, 48, 56, 42, 40, 70, 30, 27, 32, 63, 26, 37, 83, 61, 38, 22, 17, 50, 124, 19, 44, 29, 108, 72, 95, 64, 57, 68, 89, 46, 54, 102, 28, 78, 80, 90, 60, 71, 62, 34, 146, 127, 84, 100, 135, 41, 96, 165

Offset

1,2

Comments

A permutation of the natural numbers.

Links

Table of n, a(n) for n=1..70.

Formula

Satisfies: exp(Sum_{n>=1} a(n)*x^n/n) = Sum_{n>=0} A084251(n)*x^n.

Crossrefs

Cf. A084251.

Sequence in context: A324545 A003979 A378648 * A090128 A086293 A337708

Adjacent sequences: A084247 A084248 A084249 * A084251 A084252 A084253

Keyword

nonn

Author

Paul D. Hanna, May 22 2003. Revised May 29, 2003

Status

approved