A182799 Positions of primes in A167171.

1, 2, 3, 5, 7, 8, 11, 12, 15, 17, 18, 22, 25, 26, 28, 30, 34, 35, 38, 40, 41, 44, 46, 50, 55, 56, 57, 59, 60, 62, 68, 70, 73, 74, 80, 81, 83, 87, 89, 90, 93, 94, 98, 99, 101, 102, 109, 117, 119, 120, 121, 124, 125, 128, 131, 134, 137, 138, 140, 142

Offset

1,2

Comments

Complement of A182800.

Links

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

Example

A167171=(2,3,5,6,7,10,11,13,14,15,17,19,21,22,23,...)  consists of primes and products p*q of distinct primes.
a(1)=1 because 2 is in position 1;
a(4)=5 because 7 is in position 5.

Prog

(PARI) lista(nn) = {nb = 0; for (n=1, nn, if (numdiv(n) == 2*omega(n), nb++; if (isprime(n), print1(nb, ", ")); ); ); } \\ Michel Marcus, May 15 2017

Crossrefs

Cf. A000040, A167171, A182800.

Sequence in context: A281015 A288625 A189168 * A112929 A242324 A099519

Adjacent sequences: A182796 A182797 A182798 * A182800 A182801 A182802

Keyword

nonn

Author

Clark Kimberling, Dec 03 2010

Status

approved