

A134624


a(1) = 1. a(n) = the smallest integer which is > a(n1) and is different from and not coprime to A134623(n1).


2



1, 4, 6, 10, 14, 16, 18, 22, 24, 26, 27, 34, 38, 40, 42, 46, 50, 52, 58, 60, 62, 64, 66, 70, 72, 74, 75, 82, 86, 88, 90, 94, 96, 98, 99, 106, 108, 110, 112, 114, 118, 122, 123, 125, 134, 136, 138, 142, 146, 148, 154, 156, 158, 160, 162, 166, 168, 170, 171, 178, 182
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OFFSET

1,2


LINKS

Table of n, a(n) for n=1..61.
Sean A. Irvine, Java program (github)


PROG

(PARI) missing(n, v) = {my(nb = 0, k = 1, s = Set(v), ok = 0); while(!ok, if (! setsearch(s, k), nb++); ok = (nb == n); if (!ok, k++); ); k; }
nextt(start, cop) = {my(k = max(start+1, cop+1)); while(gcd(k, cop) == 1, k++); k; }
list4(nn) = {my(v3 = vector(nn), v4 = vector(nn)); v4[1] = 1; for (n=1, nn, v3[n] = missing(n, v4); if (n+1 > nn, break); v4[n+1] = nextt(v4[n], v3[n]); ); v4} \\ Michel Marcus, Sep 06 2019


CROSSREFS

Cf. A134623(n) = the nth positive integer which is missing from {a(k)}.
Sequence in context: A175706 A110507 A224467 * A171945 A310583 A298784
Adjacent sequences: A134621 A134622 A134623 * A134625 A134626 A134627


KEYWORD

nonn


AUTHOR

Leroy Quet, Nov 04 2007


EXTENSIONS

Name and one term corrected and extended by Michel Marcus, Sep 06 2019


STATUS

approved



