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A190151 A190149 converted to base 10 and halved. 2
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 (list; graph; refs; listen; history; text; internal format)
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]

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

CROSSREFS

Cf. A188548, A190149, A190150.

Sequence in context: A224442 A192049 A133246 * A144752 A073160 A242987

Adjacent sequences:  A190148 A190149 A190150 * A190152 A190153 A190154

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, May 05 2011

STATUS

approved

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Last modified July 27 12:28 EDT 2017. Contains 289852 sequences.