A102024 Indices of primes in sequence defined by A(0) = 17, A(n) = 10*A(n-1) - 3 for n > 0.
0, 1, 2, 4, 8, 10, 13, 31, 53, 54, 59, 152, 199, 460, 568, 839, 846, 1295, 1355, 2006, 2626, 2846, 3109, 6875, 9160, 17764, 33554, 59141, 65772, 280709
Offset: 1
Examples
167 is prime, hence 1 is a term.
References
- Klaus Brockhaus and Walter Oberschelp, Zahlenfolgen mit homogenem Ziffernkern, MNU 59/8 (2006), pp. 462-467.
Links
Programs
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PARI
a=17;for(n=0,1500,if(isprime(a),print1(n,","));a=10*a-3)
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PARI
for(n=0,1500,if(isprime((150*10^n+3)/9),print1(n,",")))
Formula
a(n) = A102940(n+1) - 1. - Robert Price, Nov 15 2014
Extensions
More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
a(26)-a(30) derived from A102940 by Robert Price, Nov 15 2014
Comments