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A072386 Primes which can be represented as the sum of a triangular number and its reverse. 1
2, 11, 281, 21701, 42923, 72227, 73037, 78887, 79697, 100109, 119891, 122321, 128981, 138683, 178697, 1360631, 1394831, 1591841, 1598951, 1607051, 1958591, 1982891, 2188811, 2401031, 2490941, 2793071, 3382733, 3555443, 3586853 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..29.

EXAMPLE

11 is a term because it is prime and it is the sum of triangular number 10 and its reverse 01.

MATHEMATICA

Take[Select[Union[#+IntegerReverse[#]&/@Accumulate[Range[ 5000]]], PrimeQ], 30] (* Requires Mathematica version 10 or later *)  (* Harvey P. Dale, Aug 29 2016 *)

CROSSREFS

Sequence in context: A132571 A102031 A248865 * A185122 A198894 A222206

Adjacent sequences:  A072383 A072384 A072385 * A072387 A072388 A072389

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta, Jul 20 2002

STATUS

approved

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Last modified August 8 14:04 EDT 2020. Contains 336298 sequences. (Running on oeis4.)