A066262 a(n) = gcd(n, A066260(n)).

1, 2, 3, 4, 1, 6, 1, 8, 9, 2, 1, 12, 1, 2, 3, 16, 1, 18, 1, 4, 3, 2, 1, 24, 1, 2, 27, 4, 1, 6, 1, 32, 3, 2, 1, 36, 1, 2, 3, 8, 1, 6, 1, 4, 9, 2, 1, 48, 1, 2, 3, 4, 1, 54, 5, 8, 3, 2, 1, 12, 1, 2, 9, 64, 1, 6, 1, 4, 3, 2, 1, 72, 1, 2, 3, 4, 1, 6, 1, 16, 81, 2, 1, 12, 1, 2, 3, 8, 1, 18, 1, 4, 3, 2, 5, 96

Offset

1,2

Comments

Same as A065331 through a(54); A065331(55)=1, but a(55)=5. - Jon E. Schoenfield, Jan 28 2022

Links

Harry J. Smith, Table of n, a(n) for n = 1..1000

Prog

(PARI) Composite(n) = { my(k=n + primepi(n) + 1); while (k != n + primepi(k) + 1, k = n + primepi(k) + 1); return(k) }
{ for (n=1, 100, my(f=factor(n), a=1); for (i=1, matsize(f)[1], a*=Composite(primepi(f[i, 1]))^f[i, 2]); a=gcd(n, a); print1(a, ", ") ) } \\ Harry J. Smith, Feb 07 2010

Crossrefs

Cf. A066260.

Different from A065331.

Sequence in context: A364255 A366283 A065331 * A195989 A174715 A069817

Adjacent sequences: A066259 A066260 A066261 * A066263 A066264 A066265

Keyword

nonn

Author

Reinhard Zumkeller, Dec 10 2001

Status

approved