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A062558 Number of nonisomorphic cyclic subgroups of dihedral group with 2n elements. 1
2, 2, 3, 3, 3, 4, 3, 4, 4, 4, 3, 6, 3, 4, 5, 5, 3, 6, 3, 6, 5, 4, 3, 8, 4, 4, 5, 6, 3, 8, 3, 6, 5, 4, 5, 9, 3, 4, 5, 8, 3, 8, 3, 6, 7, 4, 3, 10, 4, 6, 5, 6, 3, 8, 5, 8, 5, 4, 3, 12, 3, 4, 7, 7, 5, 8, 3, 6, 5, 8, 3, 12, 3, 4, 7, 6, 5, 8, 3, 10, 6, 4, 3, 12, 5, 4, 5, 8, 3, 12, 5, 6, 5, 4, 5, 12, 3, 6, 7, 9, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Apart from the first term, a(n) is the number of Fibonacci(k) | Fibonacci(n), with 0 < k <= n. - Paolo P. Lava, Mar 29 2017

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..1001

FORMULA

a(n) = A000005(n) + A000035(n) = tau(n)+(n mod 2), where tau(n) = the number of divisors of n.

PROG

(PARI) a(n) = numdiv(n) + (n % 2) \\ Michel Marcus, Jun 17 2013

CROSSREFS

Cf. A000005, A000045, A023645, A062249 (labeled case).

One more than A076984.

Sequence in context: A073734 A231335 A271237 * A072789 A126302 A200648

Adjacent sequences:  A062555 A062556 A062557 * A062559 A062560 A062561

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jul 03 2001

STATUS

approved

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Last modified February 28 08:28 EST 2020. Contains 332323 sequences. (Running on oeis4.)