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A277893 A277893(n) = the least k > n for which A277892(k) = A277892(n), 0 if no such number exists. 6
0, 4, 6, 9, 8, 25, 10, 12, 18, 49, 14, 93, 15, 16, 20, 169, 22, 287, 21, 26, 24, 361, 30, 33, 27, 28, 34, 529, 32, 802, 40, 35, 36, 44, 38, 934, 39, 48, 42, 1333, 46, 1681, 45, 51, 54, 1754, 50, 58, 52, 55, 64, 2209, 56, 57, 66, 60, 65, 2809, 62, 2966, 63, 68, 74, 77, 70 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

COMMENTS

a(n) is the least k larger than n for which the number of divisors of A048675(k) is equal to the number of divisors of A048675(n) (counted with multiplicity), and 0 if no such number exists (which happens only for n=2).

LINKS

Antti Karttunen, Table of n, a(n) for n = 2..102 (computed from the b-file provided by Hans Havermann for A277892)

FORMULA

For n >= 3, A277894(a(n)) = n.

PROG

(Scheme) (define (A277893 n) (cond ((= 2 n) 0) (else (let ((v (A277892 n))) (let loop ((k (+ 1 n))) (if (= (A277892 k) v) k (loop (+ 1 k))))))))

CROSSREFS

Cf. A048675, A277892, A277894, A277898.

Sequence in context: A218036 A236536 A084335 * A197575 A201660 A341577

Adjacent sequences:  A277890 A277891 A277892 * A277894 A277895 A277896

KEYWORD

nonn

AUTHOR

Antti Karttunen, Nov 08 2016

STATUS

approved

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Last modified August 1 19:31 EDT 2021. Contains 346402 sequences. (Running on oeis4.)