A166021 a(n) = 2*A000124(A003056(n-1)) if A002262(n-1)=0, otherwise a(n-1)+1.

2, 4, 5, 8, 9, 10, 14, 15, 16, 17, 22, 23, 24, 25, 26, 32, 33, 34, 35, 36, 37, 44, 45, 46, 47, 48, 49, 50, 58, 59, 60, 61, 62, 63, 64, 65, 74, 75, 76, 77, 78, 79, 80, 81, 82, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121

Offset

1,1

Links

Table of n, a(n) for n=1..65.

Prog

(MIT Scheme:) (define (A166021 n) (if (zero? (A002262 (-1+ n))) (* 2 (A000124 (A003056 (-1+ n)))) (1+ (A166021 (-1+ n)))))

Crossrefs

Complement of A136272.

Sequence in context: A101185 A045702 A005658 * A339906 A375906 A359267

Adjacent sequences: A166018 A166019 A166020 * A166022 A166023 A166024

Keyword

nonn,tabl,easy

Author

Antti Karttunen, Oct 05 2009

Status

approved