A321995 Indices of highly composite numbers A002182 which are between a twin prime pair.

3, 4, 5, 9, 11, 12, 20, 28, 30, 84, 108, 118, 143, 149, 208, 330, 362, 1002, 2395, 3160, 10535

Offset

1,1

Comments

The highly composite numbers are listed in A068507, but their growth is such that one cannot list the terms beyond A002182(362), corresponding to a(17), in the DATA section.

The term a(21) corresponds to A002182(10535) = A108951(52900585920). - Daniel Suteu, Jun 27 2019

a(22) > 779674, if it exists. - Amiram Eldar, Dec 03 2020

Links

Table of n, a(n) for n=1..21.

Formula

Intersection of A306587 and A306588. - Daniel Suteu, Jun 27 2019

Prog

(PARI) select( x->ispseudoprime(x-1)&&ispseudoprime(x+1), A2182, 1) \\ assuming A2182 holds enough terms of A002182. - M. F. Hasler, Jun 23 2019

Crossrefs

Cf. A068507, A002182, A002822.

Sequence in context: A010384 A028954 A035247 * A353302 A355159 A039885

Adjacent sequences: A321992 A321993 A321994 * A321996 A321997 A321998

Keyword

nonn,more

Author

M. F. Hasler, Jun 23 2019

Extensions

a(21) from Daniel Suteu, Jun 27 2019 (obtained from A. Flammenkamp's data)

Status

approved