A348246 Index of first occurrence of n in A307730.

1, 2, 4, 8, 47, 7, 52, 27, 17, 60, 1374, 26, 1385, 59, 46, 137, 3738, 98, 3755, 204, 83, 1399, 6680, 136, 320, 1398, 176, 224, 6703, 345, 84626, 252, 1447, 3775, 375, 203, 84657, 3774, 1446, 502, 89480, 410, 89521, 1480, 319, 6733, 91832, 542, 452, 1024, 3847, 1618, 91879, 690, 1524, 501, 3846, 6732, 173092, 1074, 173151, 84695, 645, 807, 1579, 1735, 192882

Offset: 1

Author

Rémy Sigrist and N. J. A. Sloane, Oct 17 2021

Keywords

• nonn

Comments

a(n) is the least k such that A307730(k) = n.

Examples

			For n = 6:
- sequence A307730 starts: 1, 2, 2, 3, 3, 3, 6, 4, 4, 4, 4, 6, 6, 6, 6, 6,
- the first occurrence of 6 appears at position 7,
- so a(6) = 7.
		

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000
• Rémy Sigrist, C program for A348246

Crossrefs

Cf. A307720, A307730, A307630, A348409.

Records: A348252, A348253.

Programs

C

See Links section.

Formula

A348409(n) - a(n) >= n - 1.