login
A303578
List of starts of nondecreasing runs of values of d(n) (the divisor function A000005(n)).
5
1, 5, 7, 9, 11, 13, 17, 19, 21, 23, 25, 29, 31, 33, 37, 41, 43, 46, 47, 49, 51, 53, 55, 57, 59, 61, 65, 67, 69, 71, 73, 77, 79, 81, 82, 83, 85, 89, 91, 93, 97, 101, 103, 106, 107, 109, 111, 113, 115, 118, 121, 125, 127, 129, 131, 133, 137, 139, 141, 145, 149, 151, 153, 155, 157, 161, 163, 166, 167, 169, 171, 173, 175
OFFSET
1,2
LINKS
PROG
(AWK) # Assume that b.txt contains a b-file for A000005
awk ' BEGIN {i = 1; print i}
{if ($2 < i) print $1; i = $2} ' b.txt >out
CROSSREFS
Cf. A000005.
A303577 gives the lengths of the successive runs.
A284597(m) is the smallest number that starts a run of length m.
Sequence in context: A065155 A230203 A339910 * A282057 A336366 A088502
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Apr 29 2018
STATUS
approved