A277900 Column 2 of A277898; position of the second occurrence of n in A277892.

4, 9, 25, 49, 93, 169, 287, 361, 529, 802, 934, 1333, 1681, 1754, 2209, 2809, 2966, 3482, 4453, 5041, 5329, 6241, 5378, 6374, 9167

Offset

1,1

Comments

a(n) = the second smallest number k for which A277892(k) = n, where A277892(n) = the number of prime divisors (counted with multiplicity) of A048675(n).

Note that the sequence is not monotonic: a(22) = 6241 and a(23) = 5378.

Links

Table of n, a(n) for n=1..25.

Formula

a(n) = A277893(A065091(n)).

a(n) <= A001248(n).

Example

A277892[2..4] = [0, 1, 1], thus as the second 1 occurs at A277892(4), a(1) = 4.
A277892[5..9] = [2, 1, 3, 1, 2], thus as the second 2 occurs at A277892(9), a(2) = 9.

Prog

(Scheme)
(define (A277900 n) (A277898bi n 2)) ;; Code for A277898bi given in A277898.
(define (A277900 n) (A277893 (A065091 n))) ;; Alternatively.

Crossrefs

Column 2 of A277898.

Cf. A001248 (an upper bound), A048675, A065091, A277892, A277893.

Sequence in context: A065739 A053704 A068888 * A344701 A182988 A158144

Adjacent sequences: A277897 A277898 A277899 * A277901 A277902 A277903

Keyword

nonn,more

Author

Antti Karttunen, Nov 08 2016, terms a(18)-a(25) obtained from the 10000 term b-file of A277892 computed by Hans Havermann

Status

approved