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A115705 Primes whose digit reversal is a triangular number. 2
3, 19, 307, 523, 631, 1171, 1801, 5563, 8731, 12781, 16831, 30097, 53299, 54181, 56629, 62011, 63667, 64063, 66457, 67411, 67807, 108127, 118801, 128413, 130303, 131059, 160453, 188677, 192637, 196597, 300583, 302851, 357661 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..400

EXAMPLE

307 is prime and 703=T(73).

MATHEMATICA

Select[Prime[Range[20000]], OddQ[Sqrt[1+8IntegerReverse[#]]]&] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Jun 01 2019 *)

CROSSREFS

Cf. A115704.

Sequence in context: A268646 A143597 A224681 * A136171 A102586 A326902

Adjacent sequences:  A115702 A115703 A115704 * A115706 A115707 A115708

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, Jan 31 2006

STATUS

approved

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Last modified September 23 12:20 EDT 2021. Contains 347617 sequences. (Running on oeis4.)