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 A246135 Primes that are palindromic right angle numbers in base 9 2
 173, 191, 373, 719, 50767, 1270271, 30890747159 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Table of n, a(n) for n=1..7. EXAMPLE 50767 is in the list since it is prime and is equal to 76567 in base 9. PROG (Python) from sympy import isprime A246135 = [] for n in range(1, 9): ....for m in range(n-1, -1, -1): ........l = ''.join([str(d) for d in range(n, m-1, -1)]) ........p = int(l+l[-2::-1], 9) ........if isprime(p): ............A246135.append(p) ....for m in range(n+1, 9): ........l = ''.join([str(d) for d in range(n, m+1)]) ........p = int(l+l[-2::-1], 9) ........if isprime(p): ............A246135.append(p) A246135 = sorted(A246135) CROSSREFS Cf. A246136, A244369. Sequence in context: A097845 A364937 A261530 * A140002 A178652 A119567 Adjacent sequences: A246132 A246133 A246134 * A246136 A246137 A246138 KEYWORD nonn,base,full,fini AUTHOR Chai Wah Wu, Aug 15 2014 STATUS approved

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Last modified July 22 21:11 EDT 2024. Contains 374544 sequences. (Running on oeis4.)