A078877 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A078877

Nonprimes in A078447.

1, 689, 15229, 20569, 24139, 43531, 44377, 47077, 47941, 66767, 73441, 80419, 86447, 117739, 164783, 175793, 192433, 194321, 196283, 261853, 282533, 302083, 316933, 319373, 372091, 380431, 414863, 429713, 444361, 450613, 456853, 472547

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

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..32.

PROG

(PARI) {s=[1]; for(n=2, 335, a=s[n-1]; if(!isprime(a), print1(a, ", ")); s=[a+1]; for(j=2, n, k=s[j-1]+1; c=1; while(c>0, b=1; for(i=1, matsize(s)[2], if(gcd(k, s[i])>1, b=0)); if(b==0, k++, c=0)); s=concat(s, k)))}

CROSSREFS

Cf. A078447, A078448.

Sequence in context: A204153 A204146 A259512 * A204145 A284284 A115177

Adjacent sequences: A078874 A078875 A078876 * A078878 A078879 A078880

KEYWORD

nonn

AUTHOR

Klaus Brockhaus, Dec 10 2002

STATUS

approved