A082269 Number of positive terms in row n of A082268.

1, 1, 0, 5, 15, 0, 55, 85, 0, 325, 1021, 0, 3769, 4657, 0, 21689, 61139, 0, 245677, 329385, 0, 1142389, 3953225, 0, 15980975, 20299329, 0, 75251262, 253879945, 0

Offset

1,4

Links

Table of n, a(n) for n=1..30.

Maple

A082269 := proc(n) local prts, alln, p, i, ncand, n10 ; if n = 1 then RETURN(1) ; fi ; alln := {} ; prts := combinat[partition](n, 9) ; for p from 1 to nops(prts) do n10 := combinat[permute](op(p, prts)) ; for i from 1 to nops(n10) do ncand := op(i, n10) ; ncand := add(op(j, ncand)*10^(j-1), j=1..nops(ncand) ) ; if gcd(ncand, n) = 1 and ncand <> n then alln := alln union {ncand} ; fi ; od ; od ; nops(alln) ; end: seq(A082269(n), n=1..16) ; # R. J. Mathar, Jul 15 2007 [Corrected by Sean A. Irvine, Dec 01 2025]

Crossrefs

Cf. A082268.

Sequence in context: A000331 A353610 A306155 * A367030 A107776 A290528

Adjacent sequences: A082266 A082267 A082268 * A082270 A082271 A082272

Keyword

base,more,nonn

Author

Amarnath Murthy, Apr 13 2003

Extensions

More terms from R. J. Mathar, Jul 15 2007

a(11)-a(16) corrected and a(17)-a(30) from Sean A. Irvine, Dec 01 2025

Status

approved