A165724 Digit sums of A092571.

7, 13, 19, 55, 103, 121, 127, 163, 253, 391, 721, 793, 1063, 1441, 2719, 3313, 9595, 13045, 17863, 21889, 46243, 49891

Offset

1,1

Comments

Primes in this sequence are 7, 13, 19, 103, 127,163, ....

Links

Table of n, a(n) for n=1..22.

Dario Alpern, Factorization using the Elliptic Curve Method

Formula

a(n) = 1 + 6*A056658(n). [R. J. Mathar, Sep 25 2009]

a(n) = A007953(A092571(n)). - Michel Marcus, Jul 07 2023

Example

The digit sum of 6666666666666666666666666666666666666666661 is 253.

Crossrefs

Cf. A007953, A056658, A092571.

Sequence in context: A109558 A108106 A231506 * A144232 A154756 A024732

Adjacent sequences: A165721 A165722 A165723 * A165725 A165726 A165727

Keyword

base,nonn,more

Author

Parthasarathy Nambi, Sep 25 2009

Extensions

More terms from R. J. Mathar, Sep 25 2009

Status

approved