A031317 Position of n-th 4 in A031312.

36, 38, 40, 42, 44, 157, 160, 163, 166, 169, 307, 310, 313, 316, 319, 457, 460, 463, 466, 469, 546, 549, 552, 555, 558, 561, 564, 567, 570, 573, 576, 579, 582, 585, 588, 591, 594, 597, 600, 603, 606, 607, 609, 610, 612, 613, 615

Offset: 1

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A031312.

Programs

Mathematica

Flatten[Position[Flatten[IntegerDigits[2*Range[500]-1]],4]] (* Harvey P. Dale, Aug 12 2015 *)