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A253897
Numbers n such that the sequence A127644 with a(1) = n is conjectured to give a permutation of the natural numbers.
1
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
OFFSET
1,1
COMMENTS
See A127644 for more information.
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
Sequence in context: A039095 A001957 A184484 * A100966 A358973 A063977
KEYWORD
nonn
AUTHOR
Derek Orr, Jan 17 2015
STATUS
approved