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A167843 Obtuse-angled primes. 4
113, 127, 137, 139, 149, 157, 167, 179, 199, 211, 223 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes in A135603.

Primes whose structure of digits represent 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.

LINKS

Table of n, a(n) for n=1..11.

CROSSREFS

Cf. A134811, A134951, A134971, A135603, A167841, A167842, A167844, A167845, A167846, A167853.

Sequence in context: A242557 A214503 A054033 * A159466 A284598 A060591

Adjacent sequences:  A167840 A167841 A167842 * A167844 A167845 A167846

KEYWORD

base,more,nonn

AUTHOR

Omar E. Pol, Nov 13 2009

STATUS

approved

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Last modified July 24 04:08 EDT 2019. Contains 325290 sequences. (Running on oeis4.)