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A129259
Row 1 of prime separator array A129258.
2
1, 2, 4, 7, 9, 13, 15, 18, 23, 25, 29, 31, 36, 40, 42, 46, 49, 51, 55, 58, 61, 63, 67, 71, 78, 80, 83, 85, 89, 92, 97, 102, 105, 109, 111, 113, 117, 122, 127, 130, 134, 136, 139, 142, 150, 152, 156, 159, 161, 166, 169, 173, 177, 179, 185, 187, 192, 194, 196, 199
OFFSET
1,2
COMMENTS
This contains the primes 2,7,13,23,29,31. A129260 contains all primes not here.
FORMULA
A129258 is the sequence T(n,1) defined as follows. T(1,1)=1. For n>=1, let S(n)={(i,j): 1<=i<=n and 1<=j<=n}. Once T(i,j) is defined on S(n), define T(1,n+1)=least positive integer (l.p.i.) not among T(i,j) for (i,j) in S(n); T(n+1,1)=l.p.i. not among T(i,j) for (i,j) in S(n) and not T(1,n+1); T(m,n+1)=T(m,1)*T(1,n+1) for m=2,3,...,n+1; T(n+1,m)=T(n+1,1)*T(1,m) for m=2,3,...,n+1.
EXAMPLE
Row 1 of the array A129258 with northwest corner
1 2 4 7 9 13 15 18
3 6 12 21 27 39 45 54
5 10 20 35 45 65 75 90
8 16 32 56 72 104 120 144
11 22 44 77 99 143 165 198
CROSSREFS
Sequence in context: A195669 A277733 A288933 * A077597 A183873 A036386
KEYWORD
nonn
AUTHOR
Clark Kimberling, Apr 06 2007
STATUS
approved