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A183087 Generalized canyon primes. 1
101, 103, 107, 109, 307, 313, 317, 401, 409, 419, 439, 503, 509, 523, 547, 607, 613, 617, 619, 647, 659, 701, 709, 719, 727, 739, 757, 769, 809, 823, 827, 829, 839, 857, 859, 907, 919, 929, 937, 947, 967, 1013, 1019, 1039, 1049, 1069, 2017, 2027, 2029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Primes in A183086. Supersequence of A134971 because the restriction that both cliffs are at same level (first digit equal to the final digit) is dropped here.

This sequence is finite because A183086 is.

Questions: How many terms are there in this sequence?

What is the largest term?

LINKS

Table of n, a(n) for n=1..49.

FORMULA

A000040 INTERSECT A183086.

EXAMPLE

Illustration of 751379 as a generalized canyon prime:

. . . . . 9

. . . . . .

7 . . . 7 .

. . . . . .

. 5 . . . .

. . . . . .

. . . 3 . .

. . . . . .

. . 1 . . .

. . . . . .

CROSSREFS

Cf. A134971, A167853, A183086.

Sequence in context: A048528 A164739 A085821 * A056709 A243825 A134809

Adjacent sequences:  A183084 A183085 A183086 * A183088 A183089 A183090

KEYWORD

nonn,base,fini

AUTHOR

Omar E. Pol, Jan 19 2011

STATUS

approved

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Last modified April 25 00:46 EDT 2017. Contains 285346 sequences.