A190151 - OEIS

A190151

A190149 converted to base 10 and halved.

9, 17, 19, 25, 33, 34, 35, 37, 39, 41, 49, 51, 57, 65, 66, 67, 69, 70, 71, 73, 75, 77, 79, 81, 83, 89, 97, 98, 99, 101, 103, 105, 113, 115, 121, 129, 130, 131, 132, 133, 134, 135, 137, 138, 139, 141, 142, 143, 145, 147, 149, 151, 153, 155, 157, 159, 161, 162, 163, 165, 167, 169, 177, 179, 185, 193, 194, 195, 197, 198, 199, 201, 203, 205, 207, 209, 211

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OFFSET

1,1

COMMENTS

Take the even numbers n such that in base 2 lunar arithmetic, the sum of the divisors of n is not of the form 2^k-1, and divide them (in ordinary arithmetic) by 2 (cf. A190149, A190150)

LINKS

Table of n, a(n) for n=1..77.

D. Applegate, M. LeBrun and N. J. A. Sloane, Dismal Arithmetic [Note: we have now changed the name from "dismal arithmetic" to "lunar arithmetic" - the old name was too depressing]

D. Applegate, M. LeBrun, N. J. A. Sloane, Dismal Arithmetic, J. Int. Seq. 14 (2011) # 11.9.8.

Index entries for sequences related to dismal (or lunar) arithmetic

CROSSREFS

Cf. A188548, A190149, A190150.

Sequence in context: A347250 A192049 A133246 * A144752 A317332 A073160

Adjacent sequences: A190148 A190149 A190150 * A190152 A190153 A190154

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, May 05 2011

STATUS

approved