A057748 Number of decompositions of 2n-1 into sum of a twin lucky number and a twin even-lucky-number (from A045955, A045956).

0, 1, 2, 2, 2, 3, 4, 3, 3, 5, 4, 3, 4, 3, 2, 2, 3, 5, 5, 2, 2, 5, 4, 2, 4, 7, 7, 6, 5, 4, 4, 3, 3, 5, 6, 6, 5, 5, 6, 5, 4, 6, 8, 5, 2, 3, 4, 3, 1, 3, 7, 7, 4, 3, 5, 5, 3, 4, 7, 7, 5, 4, 4, 4, 5, 7, 7, 5, 6, 8, 6, 5, 8, 9, 8, 8, 6, 4, 3, 1, 3, 7, 6, 5, 7, 9, 8, 6, 6, 8, 10, 8, 6, 7, 7, 5, 2, 2, 7, 9, 6, 8, 11, 6

Offset

1,3

Comments

Conjecture: this sequence is always positive (with n>1).

Links

Jinyuan Wang, Table of n, a(n) for n = 1..5000

Example

1 is not the sum of Twin lucky number and Twin Even-Lucky-Number, so a(1)=0; 3=1+2 (one way, so a(2)=1); 5=3+2=1+4 (so a(3)=2); etc.

Crossrefs

Cf. A000959, A057701, A045954, A045955, A045956.

Sequence in context: A178065 A366636 A366655 * A057747 A281965 A228074

Adjacent sequences: A057745 A057746 A057747 * A057749 A057750 A057751

Keyword

nonn,easy

Author

Naohiro Nomoto, Oct 30 2000

Extensions

Offset changed to 1 by Jinyuan Wang, Apr 07 2020

Status

approved