The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A299410 Numbers that can be expressed both as the sum of first deficient numbers and as the sum of first abundant numbers. 0
 30, 8388, 10093090395, 107318445076, 123649798600, 28404836330575, 85678144827202815, 456013868127570451 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Intersection of A173106 and A173107. LINKS EXAMPLE The first seven deficient numbers sum to 1 + 2 + 3 + 4 + 5 + 7 + 8 = 30 and the first two abundant numbers sum to 12 + 18 = 30. The sum of first 113 deficient numbers and the sum of first 61 abundant numbers are equal to 8388. MAPLE with(numtheory): P:=proc(q) local a, b, c, d, n; a:=0; b:=0; c:=0; d:=0; for n from 1 to q do b:=b+1; while sigma(b)<=2*b do b:=b+1; od; a:=a+b; while c

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 9 01:35 EDT 2020. Contains 336310 sequences. (Running on oeis4.)