A178458 Abundant numbers of the form k^2 + 1.

2210, 3250, 24650, 94250, 117650, 199810, 214370, 310250, 351650, 485810, 499850, 700570, 727610, 744770, 915850, 986050, 1306450, 1545050, 1814410, 1841450, 1885130, 2582450, 2699450, 3052010, 3583450, 4028050, 4678570, 5094050, 5257850, 6466850, 7059650, 7144930

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Example

2210 = 2*5*13*17, sigma(2210) = 4536 > 2*2210 and 47^2 + 1 = 2210.

Mathematica

Select[Range[3000]^2 + 1, DivisorSigma[1, #] > 2# &]

Crossrefs

Cf. A000203, A002522, A005101.

Sequence in context: A278207 A216408 A043659 * A248712 A226562 A300166

Adjacent sequences: A178455 A178456 A178457 * A178459 A178460 A178461

Keyword

nonn

Author

John L. Drost, Dec 22 2010

Status

approved