A054642 Distinct values of GCD of divisor sum of primorials and primorial itself: gcd(A002110(n), A000203(A002110(n))).

1, 6, 42, 210, 3990, 43890, 1360590, 23130030, 855811110, 11125544430, 255887521890, 20215114229310, 828819683401710, 24035770818649590, 2331469769409010230, 123567897778677542190, 5313419604483134314170

Offset

1,2

Comments

Below n=100, 30 values arise and if large enough are divisible by large primorials. E.g., for n=1..30, a(n) mod 510510 = {1, 6, 42, 210, 3990, 43890, 339570, 157080, 196350, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}.

Links

Table of n, a(n) for n=1..17.

Crossrefs

Cf. A000203, A002110, A054640, A054641.

Sequence in context: A062136 A047663 A326744 * A082139 A180286 A054613

Adjacent sequences: A054639 A054640 A054641 * A054643 A054644 A054645

Keyword

nonn

Author

Labos Elemer, May 15 2000

Status

approved