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A167843
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Obtuse-angled primes.
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5
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113, 127, 137, 139, 149, 157, 167, 179, 199, 211, 223, 227, 229, 233, 239, 257, 269, 277, 311, 331, 337, 347, 349, 359, 367, 379, 389, 421, 431, 433, 443, 449, 457, 467, 479, 499, 521, 541, 557, 569, 577, 599, 631, 641, 643, 653, 661, 677, 733, 743, 751, 761
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Primes in A135603.
Primes whose structure of digits represents an obtuse angle. The vertex is an internal digit. In the graphic representation the points are connected by imaginary line segments from left to right.
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LINKS
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Michael S. Branicky, Table of n, a(n) for n = 1..914
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PROG
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(Python) # uses agen() from A135603
from sympy import isprime
g = filter(isprime, agen())
print([next(g) for n in range(1, 53)]) # Michael S. Branicky, Aug 03 2022
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CROSSREFS
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Cf. A134811, A134951, A134971, A135603, A167841, A167842, A167844, A167845, A167846, A167853.
Sequence in context: A345072 A214503 A054033 * A159466 A284598 A060591
Adjacent sequences: A167840 A167841 A167842 * A167844 A167845 A167846
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KEYWORD
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base,nonn
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AUTHOR
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Omar E. Pol, Nov 13 2009
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EXTENSIONS
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a(12) and beyond from Michael S. Branicky, Aug 03 2022
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STATUS
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approved
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