OFFSET
1,1
REFERENCES
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards Applied Math. Series 55, 1964 (and various reprintings), p. 835.
John Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 48.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..7
M. Abramowitz and I. A. Stegun, eds., Handbook of Mathematical Functions, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972 [alternative scanned copy].
N. J. A. Sloane, An on-line version of the Encyclopedia of Integer Sequences, Electronic J. Combinatorics, Vol. 1, No. 1 (1994), Article F1.
FORMULA
a(n) = Product_{k=1..n} prime(n)^Stirling2(n, k). - Sean A. Irvine, Nov 15 2017
MATHEMATICA
a[n_] := Product[Prime[k]^Abs[StirlingS2[n, k]], {k, 1, n}]; Array[a, 5] (* Amiram Eldar, Aug 19 2025 *)
PROG
(PARI) a(n) = prod(k=1, n, prime(n)^stirling(n, k, 2)); \\ Michel Marcus, Apr 20 2022
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved
