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A227010 Places n where A225867(n) = 4. 1
10, 14, 15, 18, 20, 21, 25, 26, 27, 28, 35, 36, 37, 39, 40, 42, 49, 50, 52, 56, 63, 64, 65, 67, 72, 74, 79, 80, 84, 91, 96, 100, 101, 104, 109, 111, 112, 125, 127, 128, 144, 168, 181, 185, 192, 200, 211, 224, 256, 269, 281, 288, 293, 307, 336, 353, 379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Note that the proportion of prime terms has a tendency to increase. For example,

1 from the first 20 terms; 6 from the first 40 terms; 16 from the first 60 terms; 34 from the first 80 terms; 53 from the first 100 terms; 90 from the first 140 terms. We conjecture that this proportion asymptotically tends to 1.

LINKS

Table of n, a(n) for n=1..57.

CROSSREFS

Cf. A225867, A225868, A226977.

Sequence in context: A164936 A102361 A280032 * A246449 A121836 A317590

Adjacent sequences:  A227007 A227008 A227009 * A227011 A227012 A227013

KEYWORD

nonn

AUTHOR

Vladimir Shevelev, Jun 27 2013

STATUS

approved

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Last modified March 25 08:15 EDT 2019. Contains 321469 sequences. (Running on oeis4.)