A160268 Odd numbers k for which A006694( (k-1)/2 )< A006694( (A000265(3k+1)-1)/2 ) .

11, 23, 37, 41, 43, 59, 61, 79, 83, 97, 103, 107, 113, 121, 139, 143, 147, 149, 163, 167, 169, 171, 173, 177, 181, 183, 191, 193, 199, 201, 203, 227, 237, 243, 249, 251, 263, 271, 283, 287, 289, 293, 303, 313, 317, 321, 323, 347, 351, 353, 355, 359, 363, 367, 373, 379

Offset: 1

Author

Vladimir Shevelev, May 07 2009

Keywords

• nonn

Comments

Conjecture: For every k in the sequence, the number k^2 is in the sequence as well.

Composite numbers in the sequence which are not perfect squares are 143, 147, 171, 183 etc. [R. J. Mathar, May 16 2009]

Crossrefs

A006694, A160198, A122458, A159885, A159945, A160266, A160267.

Extensions

Edited and extended by R. J. Mathar, May 16 2009