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A129260 Column 1 of prime separator array A129258. 2
1, 3, 5, 8, 11, 14, 17, 19, 24, 26, 30, 33, 37, 41, 43, 47, 50, 53, 57, 59, 62, 64, 70, 73, 79, 81, 84, 88, 91, 95, 101, 103, 107, 110, 112, 116, 121, 123, 129, 131, 135, 137, 141, 149, 151, 154, 157, 160, 163, 167, 170, 175, 178, 181, 186, 191, 193, 195, 197, 203 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This contains the primes 3,5,11,17,19,37,41,43,47,53,... A129259 contains all primes not here.

LINKS

Table of n, a(n) for n=1..60.

FORMULA

A129258 is the sequence T(1,n) 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

Column 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

Cf. A129258, A129259.

Sequence in context: A022852 A180124 A095375 * A076829 A084505 A084555

Adjacent sequences:  A129257 A129258 A129259 * A129261 A129262 A129263

KEYWORD

nonn

AUTHOR

Clark Kimberling, Apr 06 2007

STATUS

approved

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Last modified November 23 17:10 EST 2020. Contains 338595 sequences. (Running on oeis4.)