A305234 Number of successors of n having the same value of A001221 as n.

0, 3, 2, 1, 0, 0, 2, 1, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 3, 2, 1, 0, 0, 2, 1, 0, 0, 0, 0, 2, 1, 0, 0, 0, 0, 2, 1, 0, 0, 4, 3, 2, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 3, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 3, 2, 1

Offset

1,2

Links

Table of n, a(n) for n=1..87.

Example

For n = 2: 3, 4 and 5 have the same number of distinct prime divisors as 2, but 6 does not, so a(2) = 3.

Prog

(PARI) a(n) = my(k=n+1, i=0); while(omega(k)==omega(n), i++; k++); i

Crossrefs

Cf. A001221, A077655, A305235.

Sequence in context: A083199 A327187 A274537 * A021761 A221960 A171839

Adjacent sequences: A305231 A305232 A305233 * A305235 A305236 A305237

Keyword

nonn

Author

Felix Fröhlich, May 28 2018

Status

approved