A117702 -id:A117702 - cp's OEIS frontend

A117783 Total number of palindromic primes in base 7 below 7^n.

3, 3, 9, 9, 50, 50, 204, 204, 1135, 1135, 6086, 6086, 36018, 36018, 216932, 216932, 1306070, 1306070, 8129138, 8129138, 51773946, 51773946, 326701423, 326701423

Offset: 1

Martin Renner, Apr 15 2006

Every palindrome with an even number of digits is divisible by 11 (in base 7) and therefore is composite (not prime). Hence there is no palindromic prime with an even number of digits.

Eric Weisstein's World of Mathematics, Palindromic Prime.

Partial sums of A117784.
Cf. A029975, A117702.
Cf. A117772, A117775, A117777, A117779, A117781, A117785, A117787.

a(9)-a(24) from the data at A117784 added by Amiram Eldar, Mar 21 2021

A117784 Total number of palindromic primes in base 7 with n digits.

Original entry on oeis.org

3, 0, 6, 0, 41, 0, 154, 0, 931, 0, 4951, 0, 29932, 0, 180914, 0, 1089138, 0, 6823068, 0, 43644808, 0, 274927477, 0

Offset: 1

Martin Renner, Apr 15 2006

Every palindrome with an even number of digits is divisible by 11 (in base 7) and therefore is composite (not prime). Hence there is no palindromic prime with an even number of digits.

Eric Weisstein: Palindromic Prime.

Cf. A029975, A117702.

a(9)-a(24) from Chai Wah Wu, Dec 26 2015

cp's OEIS Frontend

A117783 Total number of palindromic primes in base 7 below 7^n.

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