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A048242 Numbers that are not the sum of two abundant numbers (not necessarily distinct). 2
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28, 29, 31, 33, 34, 35, 37, 39, 41, 43, 45, 46, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99, 101, 103, 105, 107, 109 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(1456) = 20161 is the last term.

REFERENCES

The Penguin Dictionary of Curious and Interesting Numbers, David Wells, entry 20161.

Lure of the Integers, Joe Roberts, integer 20161.

Problem 13, ABACUS.

Parkin, Thomas R.; Lander, Leon J.; Abundant numbers, Aerospace Corporation, Los Angeles, 1964, 119 unnumbered pages. Copy deposited in UMT file. [From Ant King, Nov 23 2009]

Pirani, F. A. E.; Problems For Solution "E903", The American Mathematical Monthly, Vol. 57, No. 2, (February 1950), p. 113. [From Ant King, Nov 23 2009]

Pirani, F. A. E.; Moser, Leo; Selfridge, John; E903, The American Mathematical Monthly, Vol. 57, No. 8. (October 1950), pp. 561-562. [From Ant King, Nov 23 2009]

Review of "Abundant Numbers by Thomas R. Parkin and Leon J. Lander", Mathematics of Computation, Vol. 19, No. 90. (April 1965), p. 334. [From Ant King, Nov 23 2009]

LINKS

T. D. Noe, Table of n, a(n) for n=1..1456 (complete sequence)

EXAMPLE

12 is abundant, so 24=12+12 is not a term.

CROSSREFS

Cf. A005101.

Sequence in context: A135382 A230308 A064598 * A132264 A214922 A004830

Adjacent sequences:  A048239 A048240 A048241 * A048243 A048244 A048245

KEYWORD

fini,nonn,full

AUTHOR

Jud McCranie

STATUS

approved

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Last modified September 2 15:46 EDT 2014. Contains 246361 sequences.