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Search: id:A048242
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| A048242 |
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Numbers that are not the sum of two abundant numbers (not necessarily distinct). |
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+0
2
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| 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; listen)
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OFFSET
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1,2
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COMMENT
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a(1456) = 20161 is the last term.
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REFERENCES
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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 (mathstutoring(AT)ntlworld.com), 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 (mathstutoring(AT)ntlworld.com), 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 (mathstutoring(AT)ntlworld.com), 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 (mathstutoring(AT)ntlworld.com), Nov 23 2009]
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..1456 (complete sequence)
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EXAMPLE
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12 is abundant, so 24=12+12 is not a term.
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CROSSREFS
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Cf. A005101.
Sequence in context: A135381 A135382 A064598 this_sequence A132264 A004830 A081330
Adjacent sequences: A048239 A048240 A048241 this_sequence A048243 A048244 A048245
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KEYWORD
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fini,nonn,new
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AUTHOR
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Jud McCranie (j.mccranie(AT)comcast.net)
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