A353540 Starts of runs of 4 consecutive numbers whose abundancy index is larger than Pi^2/6.

8110374, 9154143, 39637323, 54957174, 78219294, 98759814, 111713874, 113603874, 118703583, 141708174, 142339923, 147934323, 165767874, 169846983, 173894874, 198219174, 222002934, 234435354, 250429023, 266664123, 269371374, 270969543, 302704674, 312610023, 315474003

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..835 (terms below 10^10)

Example

8110374 is a term since sigma(8110374)/8110374 = 2.048..., sigma(8110375)/8110375 = 1.654..., sigma(8110376)/8110376 = 1.906... and sigma(8110377)/8110377 = 1.717... are all larger than Pi^2/6 = 1.644... .

Crossrefs

Cf. A000203, A013661.

Subsequence of A353537, A353538 and A353539.

A353541 is a subsequence.

Sequence in context: A032430 A206020 A263072 * A183020 A015391 A277580

Adjacent sequences: A353537 A353538 A353539 * A353541 A353542 A353543

Keyword

nonn

Author

Amiram Eldar, Apr 25 2022

Status

approved