A140810 Positions of heptagonal numbers in the EKG sequence.

1, 12, 14, 32, 53, 76, 104, 145, 179, 226, 269, 325, 368, 450, 507, 585, 674, 749, 827, 917, 1019, 1127, 1230, 1343, 1473, 1595, 1708, 1832, 1997, 2111, 2257, 2408, 2571, 2727, 2888, 3054, 3198, 3420, 3587, 3766, 4015, 4161, 4383, 4558, 4803, 5033, 5245

Offset

1,2

Links

Table of n, a(n) for n=1..47.

Example

5688 is a heptagonal number located at position 5470 in the EKG sequence.

Crossrefs

Cf. A000566, A064413.

Sequence in context: A307167 A238228 A214504 * A330197 A127401 A332876

Adjacent sequences: A140807 A140808 A140809 * A140811 A140812 A140813

Keyword

nonn

Author

Parthasarathy Nambi, Jul 15 2008

Extensions

a(2) and a(3) interchanged by Georg Fischer, Mar 27 2024

Status

approved