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A105440
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Highly cototient numbers that are prime, or intersection of A000040 and A100827.
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1
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2, 23, 47, 59, 83, 89, 113, 167, 269, 389, 419, 509, 659, 839, 1049, 1259, 1889, 2099, 2309, 2729, 3359, 3989, 4289, 4409, 5879, 6089, 6719, 9029, 9239, 10289, 10709, 11549, 13649, 13859, 15329, 15959, 20789, 21839, 23099, 25409, 27299, 30029
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OFFSET
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1,1
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COMMENTS
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2 is definitely a "highly cototient prime". Oddly enough, though, PrimeFan does not list it as safe prime that is also a highly cototient number in RNTFS00013 even though he considers 1 to be a prime. - Robert Happelberg (roberthappelberg(AT)yahoo.com), Oct 04 2005
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LINKS
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Table of n, a(n) for n=1..42.
PrimeFan, Listing of Esoteric Integer Sequences, See RNTFS00013, RNTFS00014
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EXAMPLE
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269 (after 59 & 89) is the first prime in a sequence of primes which are congruent to 9 mod 10.
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CROSSREFS
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Cf. A000040, A100827.
Sequence in context: A068835 A156557 A002428 * A139831 A049592 A057621
Adjacent sequences: A105437 A105438 A105439 * A105441 A105442 A105443
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KEYWORD
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nonn
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AUTHOR
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Paul Muljadi, Sep 22 2005
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EXTENSIONS
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More terms from Robert Happelberg (roberthappelberg(AT)yahoo.com), Oct 04 2005
Replaced a geocities.com link - R. J. Mathar, Oct 30 2009
More terms from T. D. Noe, Mar 16 2010
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STATUS
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approved
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