A167841 Acute-angled primes.

103, 107, 109, 131, 151, 163, 173, 181, 191, 193, 197, 241, 251, 263, 271, 281, 283, 293, 307, 313, 317, 353, 373, 383, 397, 401, 409, 419, 439, 461, 463, 487, 491, 503, 509, 523, 547, 563, 571, 587, 593, 601, 607, 613, 617, 619, 647, 659, 673, 683, 691, 701, 709, 719, 727

Offset: 1

Author

Omar E. Pol, Nov 13 2009

Keywords

• base
• nonn
• fini
• full
• less

Comments

Primes whose structure of digits represents an acute angle. The vertex is an internal digit. In the graphic representation the points are connected by imaginary line segments from left to right. This sequence is finite.

Links

• Micah Manary, Table of n, a(n) for n = 1..204
• Micah Manary, Python program

Crossrefs

Primes in A135601.

Extensions

More terms from Micah Manary, Aug 02 2022