1,1

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?

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

A000040 INTERSECT A183086.

Illustration of 751379 as a generalized canyon prime:

. . . . . 9

. . . . . .

7 . . . 7 .

. 5 . . . .

. . . 3 . .

. . 1 . . .

Cf. A134971, A167853, A183086.

Sequence in context: A048528 A164739 A085821 * A056709 A243825 A309488

Adjacent sequences: A183084 A183085 A183086 * A183088 A183089 A183090

nonn,base,fini

Omar E. Pol, Jan 19 2011

approved