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A277900
Column 2 of A277898; position of the second occurrence of n in A277892.
4
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.
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
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