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A178458 Abundant numbers of the form k^2 + 1. 0
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..27.

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. 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

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Last modified November 19 00:12 EST 2019. Contains 329310 sequences. (Running on oeis4.)