A253897 - OEIS

A253897

Numbers n such that the sequence A127644 with a(1) = n is conjectured to give a permutation of the natural numbers.

3, 4, 5, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 28, 30, 33, 35, 36, 39, 40, 44, 45, 48, 50, 55, 56, 60, 63, 66, 70, 72, 75, 77, 78, 80, 84, 88, 90, 91, 99, 102, 104, 105, 108, 112, 117, 120, 126, 130, 132, 135, 140, 144, 150, 154, 160, 165, 168, 176, 180, 182, 195, 198, 208

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

See A127644 for more information.

LINKS

Table of n, a(n) for n=1..67.

EXAMPLE

a(1) = 3 because A127644 is conjectured to be a permutation of the natural numbers.

PROG

(PARI) b(r)=v=[r]; n=1; while(n<100, p=prod(i=1, #v, v[i]); if(p*n\(vecsum(v)+n)==p*n/(vecsum(v)+n)&&!vecsearch(vecsort(v), n), v=concat(v, n); n=0); n++); #v

r=1; while(r<500, if(b(r)>50, print1(r, ", ")); r++)

CROSSREFS

Cf. A127644, A252984.

Sequence in context: A039095 A001957 A184484 * A100966 A358973 A063977

Adjacent sequences: A253894 A253895 A253896 * A253898 A253899 A253900

KEYWORD

nonn

AUTHOR

Derek Orr, Jan 17 2015

STATUS

approved