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A050721 Primes arising in A083571. 3
2, 3, 11, 109, 173, 5513600773 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Prime indices of palindromic triangular numbers.

LINKS

Table of n, a(n) for n=1..6.

P. De Geest, Subsets of palindromic triangulars

CROSSREFS

Cf. A008510, A050722.

Sequence in context: A292710 A300898 A079853 * A058114 A042337 A061482

Adjacent sequences:  A050718 A050719 A050720 * A050722 A050723 A050724

KEYWORD

nonn,base,hard

AUTHOR

Patrick De Geest, Sep 15 1999.

STATUS

approved

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Last modified July 19 12:47 EDT 2018. Contains 312775 sequences. (Running on oeis4.)