A303578 List of starts of nondecreasing runs of values of d(n) (the divisor function A000005(n)).

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

Author

N. J. A. Sloane, Apr 29 2018

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005.

A303577 gives the lengths of the successive runs.

A284597(m) is the smallest number that starts a run of length m.

Programs

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