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A037170
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Numbers n such that n = pi(n) + phi(n), where pi = A000720, phi = A000010.
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2
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1, 2, 4, 8, 27, 35, 215, 235, 2611, 65113, 174647, 1301317, 1302509, 5021647, 10885081, 36319939, 70112131, 70113559, 325575773, 514258883, 742327529, 1069238453, 18721771909, 27788563039
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| a(25) > 10^11. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 06 2010]
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MATHEMATICA
| primeCount = 0; For[ i = 1, i == i, i++, If[ PrimeQ[ i ], primeCount++ ]; If[ i - EulerPhi[ i ] == primeCount, Print[ i ] ] ]
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CROSSREFS
| Sequence in context: A000643 A196265 A112285 * A006399 A056800 A034919
Adjacent sequences: A037167 A037168 A037169 * A037171 A037172 A037173
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KEYWORD
| nonn
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AUTHOR
| Naohiro Nomoto (6284968128(AT)geocities.co.jp)
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EXTENSIONS
| More terms from Alex Healy (ahealy(AT)post.harvard.edu), Mar 17 2001
a(20), a(21) from Farideh Firoozbakht (mymontain(AT)yahoo.com), Jul 20 2009
a(22)-a(24) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Feb 06 2010
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