A053225 First differences of sigma(n) that are positive.

2, 1, 3, 6, 7, 5, 16, 10, 7, 21, 22, 4, 36, 11, 16, 42, 31, 6, 43, 22, 34, 54, 40, 76, 36, 26, 66, 48, 10, 108, 34, 8, 23, 60, 58, 48, 123, 40, 10, 16, 72, 106, 5, 140, 24, 60, 144, 56, 16, 132, 73, 61, 114, 106, 172, 106, 96, 126, 66, 216, 53, 56, 156, 127, 76, 204, 44, 36

Offset

1,1

Links

Table of n, a(n) for n=1..68.

Formula

a(n) = A053222(A053224(n))

Maple

with (numtheory): seq( `if`((sigma(i) < sigma(i+1)), (sigma(i+1)-sigma(i)), print( )), i=1..139);

Crossrefs

Cf. A000203, A053222, A053227.

Sequence in context: A349980 A021472 A258047 * A050043 A113396 A294284

Adjacent sequences: A053222 A053223 A053224 * A053226 A053227 A053228

Keyword

nonn

Author

Asher Auel, Jan 06 2000

Status

approved